Drop 16-buster

Author: o-liver

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        base-image-tag: [16-buster, 16-bullseye, 18-bullseye, 16-bookworm, 18-bookworm, 20-bookworm]
+        base-image-tag: [16-bullseye, 18-bullseye, 16-bookworm, 18-bookworm, 20-bookworm]
     steps:
     - uses: actions/checkout@master
     - name: Determine Java version