Use mc-image-helper to install vanilla Minecraft. (#4165)

Co-authored-by: Geoff Bourne <itzgeoff@gmail.com>

.github/workflows/verify-pr.yml

@@ -47,6 +47,7 @@ jobs:
             mcVersion: 1.20.4
             # For GLIBC_2.34 support
             knockdRepoOrg: Metalcape/knock
+        # JAVA 8:
           - variant: java8
             baseImage: eclipse-temurin:8u312-b07-jre-focal
             platforms: linux/amd64
@@ -54,7 +55,7 @@ jobs:
             # For GLIBC_2.34 support
             knockdRepoOrg: Metalcape/knock
             # Pin version for Java 8, be sure to also set in build.yml
-            mcHelperVersion: 1.51.3-java8
+            mcHelperVersion: 1.51.4-java8
     env:
       IMAGE_TO_TEST: ${{ github.repository_owner }}/minecraft-server:test-${{ matrix.variant }}-${{ github.run_id }}
     runs-on: ubuntu-22.04