update go version

Author: johnstcn

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.20.6
+          go-version: 1.21.9
 
       - name: Import GPG key
         id: import_gpg

.github/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: "1.20"
+          go-version: "1.21"
         id: go
 
       - name: Check out code into the Go module directory
@@ -58,7 +58,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: "1.20"
+          go-version: "1.21"
         id: go
 
       - uses: hashicorp/setup-terraform@v3
@@ -88,7 +88,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: "1.20"
+          go-version: "1.21"
         id: go
 
       - uses: hashicorp/setup-terraform@v3