Added missing MemoryReserver.logger.close() call.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

gms_preprocessing/misc/locks.py

@@ -320,6 +320,7 @@ class MemoryReserver(object):
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         self.release()
+        self.logger.close()
         return True if exc_type is None else False