Bump io.grpc:grpc-bom from 1.68.0 to 1.68.1 (#9692)

Bumps [io.grpc:grpc-bom](https://github.com/grpc/grpc-java) from 1.68.0 to 1.68.1.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.0...v1.68.1)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle.kts

@@ -30,7 +30,7 @@ plugins {
 
 // Can't use typed variable syntax due to Dependabot limitations
 extra.apply {
-    set("grpcVersion", "1.68.0")
+    set("grpcVersion", "1.68.1")
     set("mapStructVersion", "1.6.2")
     set("nodeJsVersion", "18.18.0")
     set("protobufVersion", "3.25.5")