MINOR: srcJar should depend on processMessages task (#13316)

This fixes the following `./gradlew install` issue:

```text
* What went wrong:
A problem was found with the configuration of task ':storage:srcJar' (type 'Jar').
  - Gradle detected a problem with the following location: '/Users/ijuma/src/kafka/storage/src/generated/java'.

    Reason: Task ':storage:srcJar' uses this output of task ':storage:processMessages' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.

    Possible solutions:
      1. Declare task ':storage:processMessages' as an input of ':storage:srcJar'.
      2. Declare an explicit dependency on ':storage:processMessages' from ':storage:srcJar' using Task#dependsOn.
      3. Declare an explicit dependency on ':storage:processMessages' from ':storage:srcJar' using Task#mustRunAfter.

    Please refer to https://docs.gradle.org/8.0.1/userguide/validation_problems.html#implicit_dependency for more details about this problem.
```

Reviewers: David Jacot <david.jacot@gmail.com>

build.gradle

@@ -982,6 +982,7 @@ project(':core') {
   }
 
   compileJava.dependsOn 'processMessages'
+  srcJar.dependsOn 'processMessages'
 
   task genProtocolErrorDocs(type: JavaExec) {
     classpath = sourceSets.main.runtimeClasspath
@@ -1213,6 +1214,7 @@ project(':metadata') {
   }
 
   compileJava.dependsOn 'processMessages'
+  srcJar.dependsOn 'processMessages'
 
   sourceSets {
     main {
@@ -1287,6 +1289,7 @@ project(':group-coordinator') {
   }
 
   compileJava.dependsOn 'processMessages'
+  srcJar.dependsOn 'processMessages'
 }
 
 project(':examples') {
@@ -1425,6 +1428,7 @@ project(':clients') {
   }
 
   compileJava.dependsOn 'processMessages'
+  srcJar.dependsOn 'processMessages'
 
   compileTestJava.dependsOn 'processTestMessages'
 
@@ -1527,6 +1531,7 @@ project(':raft') {
   }
 
   compileJava.dependsOn 'processMessages'
+  srcJar.dependsOn 'processMessages'
 
   jar {
     dependsOn createVersionFile
@@ -1749,6 +1754,7 @@ project(':storage') {
   }
 
   compileJava.dependsOn 'processMessages'
+  srcJar.dependsOn 'processMessages'
 
   jar {
     dependsOn createVersionFile
@@ -1987,6 +1993,7 @@ project(':streams') {
   }
 
   compileJava.dependsOn 'processMessages'
+  srcJar.dependsOn 'processMessages'
 
   javadoc {
     include "**/org/apache/kafka/streams/**"