Fix web image for specVersion 7

Author: patrick96

web-image/ci/ci_common/common.jsonnet

@@ -54,7 +54,7 @@ local node_map = {
 
   maven: {
     packages+: {
-      maven: '>=3.6.3',
+      maven: '==3.9.10',
     },
   },
 

web-image/ci/ci_common/wi-run-spec.jsonnet

@@ -34,7 +34,7 @@ local os_arch_jdk_mixin(mapping) = r.task_spec(r.evaluate_late({
 
   docker_ol8: {
     docker: {
-      image: 'phx.ocir.io/oraclelabs2/c_graal/buildslave:buildslave_ol8',
+      image: 'buildslave_ol8',
       mount_modules: true,
     },
   },