Updated from global requirements

Change-Id: Iffd9930d1fb299baaaefa32347f335aec450e97c

requirements.txt

@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 six>=1.9.0 # MIT
 oslo.concurrency>=3.8.0 # Apache-2.0
-oslo.config>=3.22.0 # Apache-2.0
+oslo.config>=4.0.0 # Apache-2.0
 oslo.context>=2.14.0 # Apache-2.0
 oslo.messaging>=5.19.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0