requirements: Add starlette extra for swh.auth

requirements-swh-dev.txt

@@ -3,7 +3,7 @@
 # You can keep this list sorted alphabetically, the pip dependency resolver can sort
 # this out.
 
-../swh-auth[django]
+../swh-auth[django,starlette]
 ../swh-core[http,db,logging]
 ../swh-counters
 ../swh-dataset[luigi]

requirements-swh.txt

 # Add here internal Software Heritage dependencies, one per line.
-swh.auth[django]
+swh.auth[django,starlette]
 swh.core[db,http,logging]
 swh.counters
 swh.dataset[luigi]