chore(deps): update dependency golang-version to v1.21.0 (#967)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/go.yaml

@@ -22,7 +22,7 @@ jobs:
   check:
     uses: int128/go-workflows/.github/workflows/check.yaml@v0.1.0
     with:
-        go-version: 1.20.7
+        go-version: 1.21.0
         golangci-lint-version: v1.53.3
 
   test:
@@ -32,5 +32,5 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.20.7
+          go-version: 1.21.0
       - run: go test -v -race ./...

.github/workflows/release.yaml

@@ -57,7 +57,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.20.7
+          go-version: 1.21.0
       - run: go build -ldflags '-X main.version=${{ github.ref_name }}'
       - uses: int128/go-actions/release@v1
         with:

.github/workflows/system-test.yaml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.20.7
+          go-version: 1.21.0
 
       # for certutil
       # https://packages.ubuntu.com/xenial/libnss3-tools