bump go version in workflows

Author: jdelucaa

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: 1.18
+          go-version: 1.21
       -
         name: Import GPG key
         id: import_gpg

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: 1.18
+          go-version: 1.21
         id: go
 
       - name: Check out code into the Go module directory