deps: update google.common-protos.version to v1.18.0 (#279)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.api.grpc:grpc-google-common-protos](https://togithub.com/googleapis/java-iam) | minor | `1.17.0` -> `1.18.0` |
| [com.google.api.grpc:proto-google-common-protos](https://togithub.com/googleapis/java-iam) | minor | `1.17.0` -> `1.18.0` |

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google-cloud-bigtable-deps-bom/pom.xml

@@ -75,7 +75,7 @@
     <!-- when updating, make sure to align the versions of transitive deps below -->
     <gax.version>1.56.0</gax.version>
     <google.api-common.version>1.9.0</google.api-common.version>
-    <google.common-protos.version>1.17.0</google.common-protos.version>
+    <google.common-protos.version>1.18.0</google.common-protos.version>
     <google.core.version>1.93.4</google.core.version>
     <google.auth.version>0.20.0</google.auth.version>
     <google-http-client.version>1.35.0</google-http-client.version>