chore(ci): use the same go version as in go.mod

Author: qdm12

.github/workflows/go.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.21.4
+          go-version: 1.20
       - name: Run flaky tests sequentially
         run:
           | # Upstream flakes are race conditions exacerbated by concurrent tests
@@ -35,7 +35,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.21.4
+          go-version: 1.20
 
       - name: Run `go generate`
         run: go list ./... | grep -Pv "${EXCLUDE_REGEX}" | xargs go generate;

.github/workflows/golangci-lint.yml

@@ -21,7 +21,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: stable
+          go-version: 1.20
       - name: goheader
         # The goheader linter is only enabled in the CI so that it runs only on modified or new files
         # (see only-new-issues: true). It is disabled in .golangci.yml because

.github/workflows/rename-module.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.21.4
+          go-version: 1.20
 
       - name: Smoke tests
         # `go list` shows us the module name and grep will non-zero exit on mismatch