github workflows: upgrade actions/checkout to version 3

This is a no-op change, but github complains that nodejs is outdated if
you don't. It's not obvious why this required a major version bump...

.github/workflows/cygwin.yml

@@ -43,7 +43,7 @@ jobs:
 
       - run: git config --global core.autocrlf input
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: cygwin/cygwin-install-action@master
         with:

.github/workflows/file_format.yml

@@ -13,7 +13,7 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'

.github/workflows/images.yml

@@ -42,7 +42,7 @@ jobs:
           - { name: Ubuntu Bionic,    id: bionic   }
           - { name: Ubuntu Rolling,   id: ubuntu-rolling  }
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       # Login to dockerhub
       - name: Docker login

.github/workflows/lint.yml

@@ -22,7 +22,7 @@ jobs:
   pylint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'
@@ -32,7 +32,7 @@ jobs:
   flake8:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'
@@ -42,7 +42,7 @@ jobs:
   mypy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'

.github/workflows/macos.yml

@@ -27,7 +27,7 @@ jobs:
   unittests-appleclang:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'
@@ -66,7 +66,7 @@ jobs:
       MESON_CI_JOBNAME: ${{ matrix.NAME }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     # Avoid picking up an older version of LLVM that does not work.
     - run: brew update
     # github actions overwrites brew's python. Force it to reassert itself, by running in a separate step.
@@ -100,7 +100,7 @@ jobs:
   Qt4macos:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'

.github/workflows/msys2.yml

@@ -60,7 +60,7 @@ jobs:
         shell: msys2 {0}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: msys2/setup-msys2@v2
         with:

.github/workflows/nonative.yml

@@ -37,7 +37,7 @@ jobs:
         apt-get -y purge clang gcc gdc
         apt-get -y autoremove
         python3 -m pip install coverage codecov
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Run tests
       run: bash -c 'source /ci/env_vars.sh; cd $GITHUB_WORKSPACE; ./tools/run_with_cov.py ./run_tests.py $CI_ARGS --cross ubuntu-armhf.json --cross-only'
     - name: Upload coverage report

.github/workflows/os_comp.yml

@@ -47,7 +47,7 @@ jobs:
       MESON_CI_JOBNAME: linux-${{ matrix.cfg.id }}-gcc
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Run tests
       # All environment variables are stored inside the docker image in /ci/env_vars.sh
       # They are defined in the `env` section in each image.json. CI_ARGS should be set
@@ -103,7 +103,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Run tests
         shell: bash

.github/workflows/unusedargs_missingreturn.yml

@@ -44,7 +44,7 @@ jobs:
   linux:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'
@@ -62,7 +62,7 @@ jobs:
   windows:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'

.github/workflows/website.yml

@@ -27,7 +27,7 @@ jobs:
       HAS_SSH_KEY: ${{ secrets.WEBSITE_PRIV_KEY != '' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Install package
         run: |
           sudo apt-get -y install python3-pip ninja-build libjson-glib-dev