gapic-generator-java deps: update grpc dependencies to v1.68.0

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.grpc:grpc-core	`1.66.0` -> `1.68.0`
io.grpc:grpc-bom	`1.66.0` -> `1.68.0`

[!WARNING] Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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Sep 20 '24 15:09 renovate-bot

/gcbrun

Sep 20 '24 18:09 lqiu96

/gcbrun

Sep 23 '24 15:09 lqiu96

https://github.com/googleapis/sdk-platform-java/actions/runs/10965338486/job/30532659880?pr=3220

Error in download_and_extract: java.io.IOException: Error downloading [https://github.com/grpc/grpc-java/archive/v1.68.0.zip] to /home/runner/.cache/bazel/_bazel_runner/cf5fb8c2c66b8a944ea6af7c9b248db5/external/io_grpc_grpc_java/temp13928946065051027855/v1.68.0.zip: GET returned 404 Not Found
(15:21:47) ERROR: /home/runner/work/sdk-platform-java/sdk-platform-java/WORKSPACE:23:37: fetching http_archive rule //external:io_grpc_grpc_java: Traceback (most recent call last):
	File "/home/runner/.cache/bazel/_bazel_runner/cf5fb8c2c66b8a944ea6af7c9b248db5/external/bazel_tools/tools/build_defs/repo/http.bzl", line 132, column 45, in _http_archive_impl
		download_info = ctx.download_and_extract(
Error in download_and_extract: java.io.IOException: Error downloading [https://github.com/grpc/grpc-java/archive/v1.68.0.zip] to /home/runner/.cache/bazel/_bazel_runner/cf5fb8c2c66b8a944ea6af7c9b248db5/external/io_grpc_grpc_java/temp13928946065051027855/v1.68.0.zip: GET returned 404 Not Found

In fact, the release does not exist in the repository https://github.com/grpc/grpc-java.

Sep 24 '24 18:09 suztomo

/gcbrun

Sep 25 '24 14:09 lqiu96

/gcbrun

Sep 25 '24 18:09 lqiu96

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