Backport of ci: don't verify s390x into release/1.16.x (#18226)

backport of commit 45700f1e89

Co-authored-by: Dan Bond <danbond@protonmail.com>

.github/workflows/build.yml

@@ -371,7 +371,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        arch: ["386", "amd64", "arm", "arm64", "s390x"]
+        arch: ["386", "amd64", "arm", "arm64"]
       fail-fast: true
     env:
       version: ${{ needs.set-product-version.outputs.product-version }}