Bump Python requirement python-gnupg to 0.5.1

requirements.txt

@@ -3,7 +3,7 @@ peewee==3.16.2
 Pillow==9.5.0
 pymdown-extensions==10.0.1
 python-gitlab==3.14.0
-python-gnupg==0.5.0
+python-gnupg==0.5.1
 sh==2.0.4
 shapely==2.0.1
 tenacity==8.2.2