Revert "(ci) switch to default Maven 4"

This reverts commit 8c27bc1.

Author: slachiewicz

.github/workflows/maven-verify.yml

@@ -27,3 +27,4 @@ jobs:
     uses: apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v4
     with:
       maven4-build: true
+      maven4-version: '4.0.0-rc-3' # as in project, rc-4 needs some work