Update go version for the goreleaser (#621)

Author: kevjt

.github/workflows/build.yml

@@ -15,5 +15,5 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - run: go build ./...

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - uses: crazy-max/ghaction-import-gpg@v5
         id: import_gpg
         with: