chore(bazel): update protobuf to v3.21.3 (#24)

- [ ] Regenerate this pull request now.

chore(bazel): update gax-java to 2.18.4

PiperOrigin-RevId: 463115700

Source-Link: googleapis/googleapis@52130a9

Source-Link: https://github.com/googleapis/googleapis-gen/commit/6a4d9d9bb3afb20b0f5fa4f5d9f6740b1d0eb19a
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNmE0ZDlkOWJiM2FmYjIwYjBmNWZhNGY1ZDlmNjc0MGIxZDBlYjE5YSJ9

Author: gcf-owl-bot[bot]

proto-google-cloud-batch-v1alpha/src/main/java/com/google/cloud/batch/v1alpha/AllocationPolicy.java

@@ -13610,8 +13610,8 @@ public int getProvisioningModelsValue(int index) {
      *
      * @deprecated google.cloud.batch.v1alpha.AllocationPolicy.provisioning_models is deprecated.
      *     See google/cloud/batch/v1alpha/job.proto;l=430
-     * @param index The index of the value to return.
-     * @return The enum numeric value on the wire of provisioningModels at the given index.
+     * @param index The index to set the value at.
+     * @param value The enum numeric value on the wire for provisioningModels to set.
      * @return This builder for chaining.
      */
     @java.lang.Deprecated