fix(deps): update module google.golang.org/grpc to v1.81.1 (#37762)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [google.golang.org/grpc](https://redirect.github.com/grpc/grpc-go) |
`v1.81.0` → `v1.81.1` |
![age](https://developer.mend.io/api/mc/badges/age/go/google.golang.org%2fgrpc/v1.81.1?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/go/google.golang.org%2fgrpc/v1.81.0/v1.81.1?slim=true)
|

---

### Release Notes

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

###
[`v1.81.1`](https://redirect.github.com/grpc/grpc-go/releases/tag/v1.81.1):
Release 1.81.1

[Compare
Source](https://redirect.github.com/grpc/grpc-go/compare/v1.81.0...v1.81.1)

### Security

- xds/rbac: Fix a potential authorization bypass caused by incorrectly
falling through URI/DNS SANs to Subject Distinguished Name (DN) when
matching the authenticated principal name. With this fix, only the first
non-empty identity source will be used, as per [gRFC
A41](https://redirect.github.com/grpc/proposal/blob/master/A41-xds-rbac.md).
([#&#8203;9111](https://redirect.github.com/grpc/grpc-go/issues/9111))
- Special Thanks:
[@&#8203;al4an444](https://redirect.github.com/al4an444)

### Bug Fixes

- otel: Segregate client and server RPC information used for metrics and
traces, to avoid one overwriting the other.
([#&#8203;9081](https://redirect.github.com/grpc/grpc-go/issues/9081))

</details>

---

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<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xNDEuNSIsInVwZGF0ZWRJblZlciI6IjQzLjE0MS41IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiXX0=-->

go.mod

@@ -116,7 +116,7 @@ require (
 	golang.org/x/sync v0.20.0
 	golang.org/x/sys v0.44.0
 	golang.org/x/text v0.37.0
-	google.golang.org/grpc v1.81.0
+	google.golang.org/grpc v1.81.1
 	google.golang.org/protobuf v1.36.11
 	gopkg.in/ini.v1 v1.67.2
 	gopkg.in/yaml.v3 v3.0.1

go.sum

@@ -915,8 +915,8 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260401020348-3a24fdc17823 h1:YedBIttDguBl/zy2wJauEUm+DZZg4UXseWj0g/3N+yo=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260401020348-3a24fdc17823/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.81.0 h1:W3G9N3KQf3BU+YuCtGKJk0CmxQNbAISICD/9AORxLIw=
-google.golang.org/grpc v1.81.0/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
+google.golang.org/grpc v1.81.1 h1:VnnIIZ88UzOOKLukQi+ImGz8O1Wdp8nAGGnvOfEIWQQ=
+google.golang.org/grpc v1.81.1/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=