Bump checkout action from v2 to v3

GitHub Actions is warning about deprecation of Node 12 actions, bump
actions/checkout to fix this.

Author: lfdebrux

.github/workflows/publish.yaml

@@ -16,7 +16,7 @@ jobs:
       go: ${{ steps.gem_version.outputs.new_version }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: ruby/setup-ruby@v1
 
@@ -44,7 +44,7 @@ jobs:
     if: ${{ needs.pre.outputs.go == 'true' }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: actions/setup-node@v3
         with:

.github/workflows/test.yaml

@@ -12,7 +12,7 @@ jobs:
         ruby: ['2.7', '3.2']
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: actions/setup-node@v3
         with: