Merge pull request #4292 from square/renovate/protobuf-monorepo

Update protobuf monorepo to v3.25.6

Author: JakeWharton

gradle/libs.versions.toml

@@ -15,7 +15,7 @@
 [versions]
 kotlin = "2.1.0"
 okhttp = "3.14.9"
-protobuf = "3.25.5"
+protobuf = "3.25.6"
 robovm = "2.3.14"
 kotlinx-serialization = "1.8.0"
 autoService = "1.1.1"