chore(deps): pin dependency go to 1.16.15

Author: renovate[bot]

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Set up Go
       uses: actions/[email protected]
       with:
-        go-version: 1.16
+        go-version: 1.16.15
 
     - name: Run GoReleaser
       uses: goreleaser/[email protected]

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/[email protected]
       with:
-        go-version: 1.16
+        go-version: 1.16.15
 
     - name: Build
       run: go build -v ./...