fix: Update windows github action to use go 1.20 (#100)

* Update test-signer-windows.yml to use go '1.20'

.github/workflows/test-signer-windows.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: 1.19
+        go-version: '1.20'
 
     - name: Build
       working-directory: ./internal/signer/windows