Update golang Docker tag to v1.21.5 (#73)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci-go.yml

@@ -10,7 +10,7 @@ run-name: CI Go by @${{ github.actor }} ${{ github.sha }}
 jobs:
   build-test:
     runs-on: ubuntu-latest
-    container: golang:1.21.4
+    container: golang:1.21.5
     steps:
       - name: setup
         run: git config --global --add safe.directory $(pwd)