Update module google.golang.org/grpc to v1.69.4 - abandoned (#37196)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google.golang.org/grpc](https://redirect.github.com/grpc/grpc-go) |
`v1.69.2` -> `v1.69.4` |
[![age](https://developer.mend.io/api/mc/badges/age/go/google.golang.org%2fgrpc/v1.69.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/go/google.golang.org%2fgrpc/v1.69.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/go/google.golang.org%2fgrpc/v1.69.2/v1.69.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/go/google.golang.org%2fgrpc/v1.69.2/v1.69.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

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---

### Release Notes

<details>
<summary>grpc/grpc-go (google.golang.org/grpc)</summary>

###
[`v1.69.4`](https://redirect.github.com/grpc/grpc-go/releases/tag/v1.69.4):
Release 1.69.4

[Compare
Source](https://redirect.github.com/grpc/grpc-go/compare/v1.69.2...v1.69.4)

### Bug Fixes

- rbac: fix support for :path header matchers, which would previously
never successfully match
([#&#8203;7965](https://redirect.github.com/grpc/grpc-go/issues/7965)).

### Documentation

- examples/features/csm_observability: update example client and server
to use the helloworld service instead of echo service
([#&#8203;7945](https://redirect.github.com/grpc/grpc-go/issues/7945)).

</details>

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