Retrieve MongoDB driver version reflectively.

To avoid inlining of the final/static version value, we're using reflection to look up the version value.

Closes #4937

Author: mp911de

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/util/MongoClientVersion.java

@@ -15,9 +15,12 @@
  */
 package org.springframework.data.mongodb.util;
 
+import java.lang.reflect.Field;
+
 import org.springframework.data.util.Version;
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
 
 import com.mongodb.internal.build.MongoDriverVersion;
 
@@ -96,8 +99,9 @@ private static Version getVersionFromPackage(ClassLoader classLoader) {
 
 		if (ClassUtils.isPresent("com.mongodb.internal.build.MongoDriverVersion", classLoader)) {
 			try {
-				return Version.parse(MongoDriverVersion.VERSION);
-			} catch (IllegalArgumentException exception) {
+				Field field = ReflectionUtils.findField(MongoDriverVersion.class, "VERSION");
+				return field != null ? Version.parse("" + field.get(null)) : null;
+			} catch (ReflectiveOperationException | IllegalArgumentException exception) {
 				// well not much we can do, right?
 			}
 		}