Update workflows to use Go 1.21

.github/workflows/release.yml

@@ -169,7 +169,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           check-latest: true
 
       - name: Get project dependencies

.github/workflows/test.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           check-latest: true
       - name: Checkout codebase
         uses: actions/checkout@v3