Update grpc-java monorepo to v1.73.0 (minor)

This MR contains the following updates:

Package	Type	Update	Change
io.grpc:grpc-stub	dependencies	minor	1.72.0 -> 1.73.0
io.grpc:grpc-protobuf	dependencies	minor	1.72.0 -> 1.73.0
io.grpc:grpc-netty-shaded	dependencies	minor	1.72.0 -> 1.73.0
io.grpc:protoc-gen-grpc-java	dependencies	minor	1.72.0 -> 1.73.0

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build.gradle

@@ -34,7 +34,7 @@ protobuf {
     }
     plugins {
         grpc {
-            artifact = 'io.grpc:protoc-gen-grpc-java:1.72.0'
+            artifact = 'io.grpc:protoc-gen-grpc-java:1.73.0'
         }
     }
     generateProtoTasks {
@@ -132,9 +132,9 @@ dependencies {
 
     // GRPC communication with Janitor
     implementation('com.google.protobuf:protobuf-java:4.31.0')
-    implementation('io.grpc:grpc-netty-shaded:1.72.0')
-    implementation('io.grpc:grpc-protobuf:1.72.0')
-    implementation('io.grpc:grpc-stub:1.72.0')
+    implementation('io.grpc:grpc-netty-shaded:1.73.0')
+    implementation('io.grpc:grpc-protobuf:1.73.0')
+    implementation('io.grpc:grpc-stub:1.73.0')
 
     // CSV processing
     implementation('com.opencsv:opencsv:5.11')