fix(deps): update module google.golang.org/grpc to v1.81.1 (#803)

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)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the [Dependency
Dashboard](../issues/4) for more information.

---

### 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)

</details>

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Author: bootjp

go.mod

@@ -31,7 +31,7 @@ require (
 	go.uber.org/zap v1.28.0
 	golang.org/x/sync v0.20.0
 	golang.org/x/sys v0.44.0
-	google.golang.org/grpc v1.81.0
+	google.golang.org/grpc v1.81.1
 	google.golang.org/protobuf v1.36.11
 	pgregory.net/rapid v1.3.0
 )

go.sum

@@ -248,8 +248,8 @@ google.golang.org/genproto/googleapis/api v0.0.0-20260406154035-8fb7ec149431 h1:
 google.golang.org/genproto/googleapis/api v0.0.0-20260406154035-8fb7ec149431/go.mod h1:etfGUgejTiadZAUaEP14NP97xi1RGeawqkjDARA/UOs=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9 h1:m8qni9SQFH0tJc1X0vmnpw/0t+AImlSvp30sEupozUg=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9/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 v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=