fix(bazel): use docker version scheme for container_pull (#3948)

lib/manager/bazel/extract.js

@@ -227,6 +227,7 @@ function extractPackageFile(content) {
       dep.currentValue = currentValue;
       dep.depName = depName;
       dep.datasource = 'docker';
+      dep.versionScheme = 'docker';
       dep.lookupName = repository;
       deps.push(dep);
     } else {

test/manager/bazel/__snapshots__/extract.spec.js.snap

@@ -17,6 +17,7 @@ Array [
     "depName": "hasura",
     "depType": "container_pull",
     "lookupName": "hasura/graphql-engine",
+    "versionScheme": "docker",
   },
 ]
 `;