Update pbr from 4.2.0 to 4.3.0 (#4093)

requirements/dev.txt

@@ -75,9 +75,9 @@ scandir==1.9.0; python_version < '3.5' \
 
 # Required by mock
 funcsigs==1.0.2 --hash=sha256:330cc27ccbf7f1e992e69fef78261dc7c6569012cf397db8d3de0234e6c937ca
-pbr==4.2.0 \
-    --hash=sha256:b486975c0cafb6beeb50ca0e17ba047647f229087bd74e37f4a7e2cac17d2caa \
-    --hash=sha256:1b8be50d938c9bb75d0eaf7eda111eec1bf6dc88a62a6412e33bf077457e0f45
+pbr==4.3.0 \
+    --hash=sha256:cf36765bf2218654ae824ec8e14257259ba44e43b117fd573c8d07a9895adbdd \
+    --hash=sha256:1be135151a0da949af8c5d0ee9013d9eafada71237eb80b3ba8896b4f12ec5dc
 
 # Required by responses
 cookies==2.2.1 --hash=sha256:15bee753002dff684987b8df8c235288eb8d45f8191ae056254812dfd42c81d3