test(deps): bump com.google.api:gax-grpc (#942)

Bumps com.google.api:gax-grpc from 2.43.0 to 2.45.0.

---
updated-dependencies:
- dependency-name: com.google.api:gax-grpc
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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google-cloud-spanner-hibernate-dialect/pom.xml

@@ -64,7 +64,7 @@
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax-grpc</artifactId>
-      <version>2.43.0</version>
+      <version>2.45.0</version>
       <classifier>testlib</classifier>
       <scope>test</scope>
     </dependency>