build: use higher go version for go fmt?

.github/workflows/linter.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.18
+          go-version: 1.20
       - name: Run go fmt
         run: |
           NON_COMPLIANT_FILES=$(gofmt -s -l $(find . -type f -name '*.go'| grep -v "/.template/"))