Deps: Update non-bazel/repository_locations.bzl dependencies (#6833)

Update buildifier from 0.22.0 to 0.25.0 (release notes), bazel-compilation-database from 0.3.2 to 0.3.3 (release notes), bazel-skylib from 0.7.0 to 0.8.0 (release notes) and change to developer provided tar download and protoc-gen-validate from 0.13.0 to 0.14.0 (release notes).

Risk Level: Low
Testing: bazel bazel test //test/...
Docs Changes: none required
Release Notes: none required

Signed-off-by: Michael Payne <michael@sooper.org>

Mirrored from https://github.com/envoyproxy/envoy @ 8b1f6eaa7aa28c14640b2ed779738a8d7be33a34

bazel/repository_locations.bzl

@@ -1,5 +1,5 @@
-BAZEL_SKYLIB_RELEASE = "0.7.0"
-BAZEL_SKYLIB_SHA256 = "2c62d8cd4ab1e65c08647eb4afe38f51591f43f7f0885e7769832fa137633dcb"
+BAZEL_SKYLIB_RELEASE = "0.8.0"
+BAZEL_SKYLIB_SHA256 = "2ef429f5d7ce7111263289644d233707dba35e39696377ebab8b0bc701f7818e"
 
 GOGOPROTO_RELEASE = "1.2.1"
 GOGOPROTO_SHA256 = "99e423905ba8921e86817607a5294ffeedb66fdd4a85efce5eb2848f715fdb3a"
@@ -7,8 +7,8 @@ GOGOPROTO_SHA256 = "99e423905ba8921e86817607a5294ffeedb66fdd4a85efce5eb2848f715f
 OPENCENSUS_RELEASE = "0.1.0"
 OPENCENSUS_SHA256 = "4fd21cc6de63d7cb979fd749d8101ff425905aa0826fed26019d1c311fcf19a7"
 
-PGV_RELEASE = "0.0.13"
-PGV_SHA256 = "dce6c8a43849d2abe4d5e40f16e9a476bca6b7a47e128db4458a52d748f4a5eb"
+PGV_RELEASE = "0.0.14"
+PGV_SHA256 = "c45e629e8c174886a73ec251b94d5470526c7c1e2596cf17755065aed15b9254"
 
 GOOGLEAPIS_GIT_SHA = "d642131a6e6582fc226caf9893cb7fe7885b3411"  # May 23, 2018
 GOOGLEAPIS_SHA = "16f5b2e8bf1e747a32f9a62e211f8f33c94645492e9bbd72458061d9a9de1f63"
@@ -21,8 +21,7 @@ KAFKA_SOURCE_SHA = "ae7a1696c0a0302b43c5b21e515c37e6ecd365941f68a510a7e442eebddf
 REPOSITORY_LOCATIONS = dict(
     bazel_skylib = dict(
         sha256 = BAZEL_SKYLIB_SHA256,
-        strip_prefix = "bazel-skylib-" + BAZEL_SKYLIB_RELEASE,
-        urls = ["https://github.com/bazelbuild/bazel-skylib/archive/" + BAZEL_SKYLIB_RELEASE + ".tar.gz"],
+        urls = ["https://github.com/bazelbuild/bazel-skylib/releases/download/" + BAZEL_SKYLIB_RELEASE + "/bazel-skylib." + BAZEL_SKYLIB_RELEASE + ".tar.gz"],
     ),
     com_lyft_protoc_gen_validate = dict(
         sha256 = PGV_SHA256,