chore: update requirements.txt to address dependabot security alerts.…

… (#1936)

Created by running:
pip-compile requirements.in --generate-hashes --upgrade within synthtool/gcp/templates/java_library/.kokoro and synthtool/docker/owlbot/java/src/
Source-Link: googleapis/synthtool@853dbcd
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:084ad4c60551b075846bcb2405ec1c14b0d00ec1eb5503d4dd0d2a92cdc2d3e2

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:0d1bb26a1a99ae0456176bf891b8490e9aab424a5cb4e4d301d9703c4dc43b58
-# created: 2024-01-30T19:46:55.029238294Z
+  digest: sha256:084ad4c60551b075846bcb2405ec1c14b0d00ec1eb5503d4dd0d2a92cdc2d3e2
+# created: 2024-03-15T14:33:32.257974519Z

renovate.json

@@ -66,7 +66,8 @@
         "^com.google.truth:truth",
         "^org.mockito:mockito-core",
         "^org.objenesis:objenesis",
-        "^com.google.cloud:google-cloud-conformance-tests"
+        "^com.google.cloud:google-cloud-conformance-tests",
+        "^org.graalvm.buildtools:junit-platform-native"
       ],
       "semanticCommitType": "test",
       "semanticCommitScope": "deps"