chore(deps): update grpc to v1.68.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
com_github_grpc_grpc	http_archive	minor	v1.67.0 -> v1.68.0
grpc	bazel_dep	minor	1.66.0 -> 1.68.0
grpc/grpc		minor	v1.67.0 -> v1.68.0

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Release Notes

grpc/grpc (com_github_grpc_grpc)

### [`v1.68.0`](https://redirect.github.com/grpc/grpc/releases/tag/v1.68.0) [Compare Source](https://redirect.github.com/grpc/grpc/compare/v1.68.0-pre1...v1.68.0) This is release 1.68.0 ([groovy](https://redirect.github.com/grpc/grpc/blob/master/doc/g_stands_for.md)) of gRPC Core. For gRPC documentation, see [grpc.io](https://grpc.io/). For previous releases, see [Releases](https://redirect.github.com/grpc/grpc/releases). This release contains refinements, improvements, and bug fixes, with highlights listed below. ## Core - \[XdsClient]\[Backport] Add missing authority to XdsClient metrics scope ([#​38009](https://redirect.github.com/grpc/grpc/issues/38009)). ([#​38023](https://redirect.github.com/grpc/grpc/pull/38023)) - \[Release] Bump core version in preparation for 1.68 Branch Cut. ([#​37941](https://redirect.github.com/grpc/grpc/pull/37941)) - \[ConfigFetcher] Set HTTP2 error to NO_ERROR to do graceful GOAWAYs. ([#​37939](https://redirect.github.com/grpc/grpc/pull/37939)) - \[ruby] reduce INFO log for server CQ pluck registration to DEBUG. ([#​37633](https://redirect.github.com/grpc/grpc/pull/37633)) - \[EventEngine] Enable the PosixEventEngine client experiment. ([#​35985](https://redirect.github.com/grpc/grpc/pull/35985)) - \[chttp2\_server] Fix race between connection starting and it being orphaned. ([#​37683](https://redirect.github.com/grpc/grpc/pull/37683)) - \[Chttp2Server] Fix race between connection manager updates and handshake. ([#​37772](https://redirect.github.com/grpc/grpc/pull/37772)) - \[xds] Fix XdsClient race between ResourceDoesNotExist timer and receiving resources. ([#​37678](https://redirect.github.com/grpc/grpc/pull/37678)) ## C++ - \[Build] Minimum version of MSVC is now 2022. ([#​37687](https://redirect.github.com/grpc/grpc/pull/37687)) - \[Build] Bumped the minimum version of cmake. ([#​37702](https://redirect.github.com/grpc/grpc/pull/37702)) ## Python - Add templating and support for Python 3.13. ([#​37643](https://redirect.github.com/grpc/grpc/pull/37643)) ### [`v1.68.0-pre1`](https://redirect.github.com/grpc/grpc/releases/tag/v1.68.0-pre1) [Compare Source](https://redirect.github.com/grpc/grpc/compare/v1.67.1...v1.68.0-pre1) This is a prerelease of gRPC Core 1.68.0 (groovy). For gRPC documentation, see [grpc.io](https://grpc.io/). For previous releases, see [Releases](https://redirect.github.com/grpc/grpc/releases). This prerelease contains refinements, improvements, and bug fixes. ### [`v1.67.1`](https://redirect.github.com/grpc/grpc/releases/tag/v1.67.1) [Compare Source](https://redirect.github.com/grpc/grpc/compare/v1.67.0...v1.67.1) This is release gRPC Core 1.67.1 (gesundheit). This is a Python-only patch release. For gRPC documentation, see [grpc.io](https://grpc.io/). For previous releases, see [Releases](https://redirect.github.com/grpc/grpc/releases). This release contains refinements, improvements, and bug fixes.

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This change is 

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.00%. Comparing base (9424345) to head (be48819).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #14807 +/- ## ======================================= Coverage 93.00% 93.00% ======================================= Files 2351 2351 Lines 209479 209479 ======================================= + Hits 194818 194826 +8 + Misses 14661 14653 -8 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

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