fix: update protobuf monorepo (#562)

Author: renovate-bot

spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-v1/spannerlib-dotnet-grpc-v1.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Google.Cloud.Spanner.V1" Version="5.2.0" />
-    <PackageReference Include="Google.Protobuf" Version="3.31.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.33.0" />
     <PackageReference Include="Grpc.Net.Client" Version="2.71.0" />
   </ItemGroup>
 

spannerlib/wrappers/spannerlib-java/pom.xml

@@ -30,7 +30,7 @@
       <dependency>
         <groupId>com.google.protobuf</groupId>
         <artifactId>protobuf-bom</artifactId>
-        <version>4.32.1</version>
+        <version>4.33.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>