Bump grpcVersion from 1.68.2 to 1.69.0 in /java-to-java/java-grpc-server #6023

Job	Run time
configure	0s
latest_versions	9s
build-java17 (java-to-java, java-api-server, ./gradlew bootBuildImage, java-grpc-server, ./gradle...	2m 22s
build-java17 (java-to-rust, java-grpc-example, ./gradlew bootBuildImage, protoc --proto_path=./ru...	2m 4s
build-java17 (micronaut-to-springboot, java-micronaut-grpc-server, ./gradlew bootBuildImage, dock...	2m 10s
	6m 45s

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