bump scmrepo to 0.0.23

`scmrepo==0.0.23` includes proper support for windows file:// URLs
(https://github.com/iterative/scmrepo/pull/68), so Windows tests
relying on file URLs had to be fixed in order to be valid
[RFC 8089](https://datatracker.ietf.org/doc/html/rfc8089) URLs.

tests/func/test_external_repo.py

@@ -57,7 +57,7 @@ def test_cache_reused(erepo_dir, mocker, local_cloud):
     download_spy = mocker.spy(generic, "transfer")
 
     # Use URL to prevent any fishy optimizations
-    url = f"file://{erepo_dir}"
+    url = f"file://{erepo_dir.as_posix()}"
     with external_repo(url) as repo:
         repo.fetch()
         assert download_spy.mock.call_count == 1
@@ -72,7 +72,7 @@ def test_cache_reused(erepo_dir, mocker, local_cloud):
 def test_known_sha(erepo_dir):
     erepo_dir.scm.commit("init")
 
-    url = f"file://{erepo_dir}"
+    url = f"file://{erepo_dir.as_posix()}"
     with external_repo(url) as repo:
         rev = repo.scm.get_rev()
         prev_rev = repo.scm.resolve_rev("HEAD^")