use Go 1.21 by default on CI

Author: rhysd

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        go: ['1.19', '1.20']
+        go: ['1.20', '1.21']
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install dependencies on macOS
@@ -63,7 +63,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - uses: actions/setup-node@v3
         with:
           node-version: "lts/*"
@@ -85,7 +85,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - name: Check Go sources are formatted
         run: |
           diffs="$(gofmt -d ./*.go ./cmd/actionlint/*.go ./scripts/*/*.go ./playground/*.go)"
@@ -110,7 +110,7 @@ jobs:
         uses: docker/build-push-action@v3
         with:
           build-args: |
-            GOLANG_VER=1.20
+            GOLANG_VER=1.21
           push: false
       - name: Test Docker image
         run: docker container run

.github/workflows/codeql.yaml

@@ -37,7 +37,7 @@ jobs:
         if: ${{ matrix.language != 'go' }}
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
         if: ${{ matrix.language == 'go' }}
       - name: Build Go sources
         run: |

.github/workflows/generate.yaml

@@ -23,7 +23,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - name: Check new release on GitHub
         run: go run ./scripts/generate-popular-actions -d
       - run: go generate

.github/workflows/matcher.yaml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - uses: actions/setup-node@v3
         with:
           node-version: "lts/*"

.github/workflows/release.yaml

@@ -19,7 +19,7 @@ jobs:
       - run: ronn ./man/actionlint.1.ronn
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - uses: goreleaser/goreleaser-action@v4
         with:
           version: latest
@@ -77,7 +77,7 @@ jobs:
         with:
           platforms: linux/amd64,linux/arm64
           build-args: |
-            GOLANG_VER=1.20
+            GOLANG_VER=1.21
             ACTIONLINT_VER=${{ steps.tag.outputs.name }}
           push: true
           tags: |