build: bump the grpc-deps group across 1 directory with 3 updates

[dependabot]

Bumps the grpc-deps group with 3 updates in the / directory: grpcio, grpcio-health-checking and protobuf.

Updates grpcio from 1.67.1 to 1.68.1

Release notes

Sourced from grpcio's releases.

Release v1.68.1

This is release 1.68.1 (groovy) of gRPC Core.

For gRPC documentation, see grpc.io. For previous releases, see Releases.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

Core

• [xDS RBAC] Support string_match in HeaderMatcher (#38185). (#38198)

Release v1.68.0

This is release 1.68.0 (groovy) of gRPC Core.

For gRPC documentation, see grpc.io. For previous releases, see Releases.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

Core

• [XdsClient][Backport] Add missing authority to XdsClient metrics scope (#38009). (#38023)
• [Release] Bump core version in preparation for 1.68 Branch Cut. (#37941)
• [ConfigFetcher] Set HTTP2 error to NO_ERROR to do graceful GOAWAYs. (#37939)
• [ruby] reduce INFO log for server CQ pluck registration to DEBUG. (#37633)
• [EventEngine] Enable the PosixEventEngine client experiment. (#35985)
• [chttp2_server] Fix race between connection starting and it being orphaned. (#37683)
• [Chttp2Server] Fix race between connection manager updates and handshake. (#37772)
• [xds] Fix XdsClient race between ResourceDoesNotExist timer and receiving resources. (#37678)

C++

• [Build] Minimum version of MSVC is now 2022. (#37687)
• [Build] Bumped the minimum version of cmake. (#37702)

Python

• Add templating and support for Python 3.13. (#37643)

Release v1.68.0-pre1

This is a prerelease of gRPC Core 1.68.0 (groovy).

For gRPC documentation, see grpc.io. For previous releases, see Releases.

This prerelease contains refinements, improvements, and bug fixes.

Commits

• 796e87f [Release] Bump version to 1.68.1 (on v1.68.x branch) (#38202)
• ef921bf [Release] Bump Core patch version in preparation for patch release (#38201)
• 2027e7b [xDS RBAC] Support string_match in HeaderMatcher (#38185) (#38198)
• 7e442a0 [CSM Observability] Add option to use Xds server (v1.68.x backport) (#38199)
• e2b67e1 [CSM] Use xds-enabled server and xds credentials in examples (#38192) (#38195)
• 6b49ae6 [Release] Bump v.1.68.x to 1.68.0 (#38124)
• 2bcf835 [Backport][chttp2] Fix channelz address (#38022) (#38027)
• 5801d12 [XdsClient][Backport] Add missing authority to XdsClient metrics scope (#3800...
• 62e547b Bump v1.68.x version to v1.68.0-pre1 (#38001)
• 1178b2d [retry e2e test] add log message about known flakiness (#37974)
• Additional commits viewable in compare view

Updates grpcio-health-checking from 1.67.1 to 1.68.1

Updates protobuf from 5.28.3 to 5.29.2

Commits

• 2330983 Updating version.json and repo version numbers to: 29.2
• 1772657 Automated rollback of commit 23aada230b2478c7a07fe7612489eb8e79b9c379. (#19692)
• 8b9d76c Export environment variables so bazelisk picks them up (#19690)
• a1c9b6a Pin staleness check to Bazel 7 (#19689)
• 3649f87 Remove unused / invalid C++ lazy repeated field code from OSS. (#19682)
• 3a7bb4a Remove CMake downgrade workaround from Windows CI tests (#19630)
• d7d3da6 Merge pull request #19506 from protocolbuffers/29.x-202412032207
• a3e9db8 Updating version.json and repo version numbers to: 29.2-dev
• 796e49f Updating version.json and repo version numbers to: 29.1
• ba6da44 Rename maven to protobuf_maven in MODULE.bazel (#18641) (#19477)
• Additional commits viewable in compare view

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