deps: Bump `com_github_bufbuild_buf` -> 1.6.0 (#21904)

Fix #21867

Signed-off-by: Ryan Northey <ryan@synca.io>

Mirrored from https://github.com/envoyproxy/envoy @ 454292387521e6ee3a23dc891ff1097d6149e295

bazel/repository_locations.bzl

@@ -111,11 +111,11 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         project_name = "buf",
         project_desc = "A new way of working with Protocol Buffers.",  # Used for breaking change detection in API protobufs
         project_url = "https://buf.build",
-        version = "1.5.0",
-        sha256 = "4e28ac1c5e75d35595f4437ad6e1006a65c131db5528b682cd6c8561212c523c",
+        version = "1.6.0",
+        sha256 = "b83fd806a9f69b5d9addf838dcd9fae4ec8da4bbf367aa08511cd83b225f3cb0",
         strip_prefix = "buf",
         urls = ["https://github.com/bufbuild/buf/releases/download/v{version}/buf-Linux-x86_64.tar.gz"],
-        release_date = "2022-05-30",
+        release_date = "2022-06-21",
         use_category = ["api"],
         tags = ["manual"],
     ),