Remove language level override for type_annotations

Now that the default is new enough to support type annotations, overriding it here isn't necessary.

PiperOrigin-RevId: 696900786

type_annotations/pom.xml

@@ -43,18 +43,4 @@
       <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
     </license>
   </licenses>
-
-  <build>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <configuration>
-          <source>17</source>
-          <target>17</target>
-          <compilerArgs combine.self="override" />
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
 </project>