chore(deps): update actions/checkout action to v3 (#9)

Author: renovate[bot]

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
   macos_build:
     runs-on: macos-11.0
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: cgrindel/gha_set_up_bazel@v1
       with:
         repo_name: github_snippets