Bump io.grpc:grpc-stub from 1.64.0 to 1.66.0

Bumps [io.grpc:grpc-stub](https://github.com/grpc/grpc-java) from 1.64.0 to 1.66.0.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.64.0...v1.66.0)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-stub
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -54,7 +54,7 @@
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-stub</artifactId>
-      <version>1.64.0</version>
+      <version>1.66.0</version>
     </dependency>
     <!-- Default OIDC implementation. Must be provided by the user. -->
     <dependency>