DEVELOPERS: add Raphaël Mélotte as developer for python-s3transfer test

Follows c15734e3d25c7b7ee97a7a48d45457b926daf159 ("support/testing:
add new test for python-s3transfer")

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -2436,7 +2436,9 @@ F:	package/python-pymupdf/
 F:	package/python-rsa/
 F:	package/python-s3transfer/
 F:	support/testing/tests/package/sample_python_rsa.py
+F:	support/testing/tests/package/sample_python_s3transfer.py
 F:	support/testing/tests/package/test_python_rsa.py
+F:	support/testing/tests/package/test_python_s3transfer.py
 
 N:	Refik Tuzakli <tuzakli.refik@gmail.com>
 F:	package/freescale-imx/