Update grpc-java monorepo to v1.78.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ asm = "9.9"
 checkerQual = "3.52.1"
 coroutines = "1.10.2"
 dokka = "2.0.0"
-grpc = "1.76.0"
+grpc = "1.78.0"
 gson = "2.13.2"
 guava = "32.1.3-jre"
 javapoet = "0.9.0"

wire-reflector/build.gradle.kts

@@ -14,7 +14,7 @@ dependencies {
   api(projects.wireSchema)
   implementation(libs.okio.core)
   api(libs.guava)
-  implementation("io.grpc:grpc-protobuf:1.76.0")
+  implementation("io.grpc:grpc-protobuf:1.78.0")
   implementation("com.google.protobuf:protoc:4.33.1")
 
   testImplementation(projects.wireTestUtils)