File protobuf-3.19.6-jre21.patch of Package protobuf

FTBFS with java-21-openjdk since support for 1.7 was dropped in JDK 20:

[ERROR] Source option 7 is no longer supported. Use 8 or later.
[ERROR] Target option 7 is no longer supported. Use 8 or later.

--- protobuf-3.19.6/java/pom.xml.jre21	2022-02-13 11:45:39.367028268 +0900
+++ protobuf-3.19.6/java/pom.xml	2024-04-03 12:43:18.212542147 +0900
@@ -111,8 +112,8 @@
           <artifactId>maven-compiler-plugin</artifactId>
           <version>3.6.1</version>
           <configuration>
-            <source>1.7</source>
-            <target>1.7</target>
+            <source>1.8</source>
+            <target>1.8</target>
           </configuration>
         </plugin>
         <plugin>