build: upgrade Java microgenerator to v2.2.1 (googleapis#726)

* build: upgrade Java microgenerator to v2.2.1

# v2.2.1

## Bug Fixes
- gax batching regression (googleapis#863) (3a6f168)

# v2.2.0

## Features
- Add REST AIP-151 LRO suport (cb1b534)
- enable self signed JWT for http (googleapis#850) (aba0ec0)
- Implement DIREGAPIC LRO annotations (googleapis#832) (d7b29e0)
- REGAPIC initial implementation (googleapis#824) (fdcfe70)
- REGAPIC Multitransport implementation (grpc+rest) (googleapis#833) (445daf4)

## Bug Fixes
- [bazel] fix rest transport handling in assembly rule (googleapis#835) (92f7c1c)
- DIREGAPIC LRO generated tests logic (googleapis#838) (8ae8e6f)
- fix diregapic-lro logic (googleapis#834) (957f69a)

PiperOrigin-RevId: 405492216

Source-Link: googleapis/googleapis@4381242

Source-Link: https://github.com/googleapis/googleapis-gen/commit/8d1ecc73009d949803fe1745f4617546a8cb74fc
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiOGQxZWNjNzMwMDlkOTQ5ODAzZmUxNzQ1ZjQ2MTc1NDZhOGNiNzRmYyJ9

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

google-cloud-logging/src/main/java/com/google/cloud/logging/v2/stub/GrpcLoggingServiceV2Stub.java

@@ -231,7 +231,7 @@ protected GrpcLoggingServiceV2Stub(
         callableFactory.createUnaryCallable(
             deleteLogTransportSettings, settings.deleteLogSettings(), clientContext);
     this.writeLogEntriesCallable =
-        callableFactory.createUnaryCallable(
+        callableFactory.createBatchingCallable(
             writeLogEntriesTransportSettings, settings.writeLogEntriesSettings(), clientContext);
     this.listLogEntriesCallable =
         callableFactory.createUnaryCallable(