Revert "build(deps): bump grpcVersion from 1.57.2 to 1.69.0 in /sdk/j… (

#1523)

…ava (#1522)"

This reverts commit 5e16376 because the
minimal example test is failing with:

```
Warning: WARNING] 
        Dependency convergence error for com.google.errorprone:error_prone_annotations:jar:2.18.0:compile paths to dependency are:
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-io.grpc:grpc-okhttp:jar:1.57.2:compile
            +-io.grpc:grpc-core:jar:1.57.2:compile
              +-io.grpc:grpc-api:jar:1.57.2:compile
                +-com.google.errorprone:error_prone_annotations:jar:2.18.0:compile
        and
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-io.grpc:grpc-okhttp:jar:1.57.2:compile
            +-io.grpc:grpc-core:jar:1.57.2:compile
              +-com.google.errorprone:error_prone_annotations:jar:2.18.0:compile
        and
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-com.pulumi:pulumi:jar:0.20.1-alpha.1735072535+5e163768:compile
            +-io.grpc:grpc-stub:jar:1.69.0:runtime
              +-com.google.errorprone:error_prone_annotations:jar:2.30.0:runtime
        
Warning: WARNING] 
        Dependency convergence error for io.grpc:grpc-api:jar:1.57.2:compile paths to dependency are:
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-io.grpc:grpc-okhttp:jar:1.57.2:compile
            +-io.grpc:grpc-core:jar:1.57.2:compile
              +-io.grpc:grpc-api:jar:1.57.2:compile
        and
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-io.grpc:grpc-okhttp:jar:1.57.2:compile
            +-io.grpc:grpc-core:jar:1.57.2:compile
              +-io.grpc:grpc-context:jar:1.57.2:runtime
                +-io.grpc:grpc-api:jar:1.57.2:runtime
        and
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-com.pulumi:pulumi:jar:0.20.1-alpha.1735072535+5e163768:compile
            +-io.grpc:grpc-protobuf:jar:1.69.0:runtime
              +-io.grpc:grpc-api:jar:1.69.0:runtime
        and
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-com.pulumi:pulumi:jar:0.20.1-alpha.1735072535+5e163768:compile
            +-io.grpc:grpc-protobuf:jar:1.69.0:runtime
              +-io.grpc:grpc-protobuf-lite:jar:1.69.0:runtime
                +-io.grpc:grpc-api:jar:1.69.0:runtime
        and
        +-com.pulumi.example:minimal:jar:1.0-SNAPSHOT
          +-com.pulumi:pulumi:jar:0.20.1-alpha.1735072535+5e163768:compile
            +-io.grpc:grpc-stub:jar:1.69.0:runtime
              +-io.grpc:grpc-api:jar:1.69.0:runtime
```

sdk/java/pulumi/build.gradle

@@ -22,7 +22,7 @@ repositories {
     mavenLocal()
 }
 
-def grpcVersion = "1.69.0"
+def grpcVersion = "1.57.2"
 def protobufVersion = "3.25.5"
 def protocVersion = protobufVersion
 def guavaVersion = "32.1.2-jre"