Fix get-station-data dependency in setup.cfg

https://stackoverflow.com/questions/32688688/how-to-write-setup-py-to-include-a-git-repository-as-a-dependency/54701434#54701434

setup.cfg

@@ -37,7 +37,7 @@ install_requires =
     pooch
     gcsfs
     zarr
-    get-station-data @ git+https://github.com/scotthosking/get-station-data@main#egg=get-station-data
+    get-station-data @ git+ssh://git@github.com/scotthosking/get-station-dat.git
 
 [options.extras_require]
 testing =