Add internal dependency management for gRPC

Closes spring-projectsgh-46444

Author: snicoll

module/spring-boot-opentelemetry/build.gradle

@@ -46,5 +46,5 @@ dependencies {
 	testImplementation("com.squareup.okhttp3:mockwebserver")
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
-	testRuntimeOnly("io.grpc:grpc-api:1.72.0")
+	testRuntimeOnly("io.grpc:grpc-api")
 }

module/spring-boot-tracing/build.gradle

@@ -64,5 +64,5 @@ dependencies {
 	testImplementation("org.eclipse.jetty.http2:jetty-http2-server")
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
-	testRuntimeOnly("io.grpc:grpc-api:1.72.0")
+	testRuntimeOnly("io.grpc:grpc-api")
 }

platform/spring-boot-internal-dependencies/build.gradle

@@ -90,7 +90,12 @@ bom {
 				"jsr305"
 			]
 		}
-	}	
+	}
+	library("gRPC", "1.73.0") {
+		group("io.grpc") {
+			bom("grpc-bom")
+		}
+	}
 	library("Janino", "3.1.12") {
 		group("org.codehaus.janino") {
 			bom("janino") {