chore: manual fix for java-firestore migration

b/477663340

Author: suztomo

.github/workflows/java-firestore-ci.yaml

@@ -129,6 +129,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
     - uses: actions/setup-java@v4
       with:
         distribution: temurin
@@ -137,3 +139,5 @@ jobs:
     - run: .kokoro/build.sh
       env:
         JOB_TYPE: lint
+        HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+        BASE_SHA: ${{ github.event.pull_request.base.sha }}

.kokoro/presubmit/firestore-integration.cfg

@@ -3,7 +3,7 @@
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
   key: "TRAMPOLINE_IMAGE"
-  value: "gcr.io/cloud-devrel-kokoro-resources/java8"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java11"
 }
 
 env_vars: {