Update moto[s3,server] remove upper version bound (#248)

* Update moto[s3,server] requirement from <5 to <6

Updates the requirements on [moto[s3,server]](https://github.com/getmoto/moto) to permit the latest version.
- [Release notes](https://github.com/getmoto/moto/releases)
- [Changelog](https://github.com/getmoto/moto/blob/master/CHANGELOG.md)
- [Commits](getmoto/moto@0.0.7...5.0.12)

---
updated-dependencies:
- dependency-name: moto[s3,server]
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

* tests: update moto usage for compatibility with newer versions

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Andreas Poehlmann <ap--@users.noreply.github.com>

setup.cfg

@@ -43,7 +43,7 @@ dev =
     requests
     gcsfs
     s3fs
-    moto[s3,server]<5
+    moto[s3,server]
     webdav4[fsspec]
     wsgidav
     cheroot

upath/tests/conftest.py

@@ -140,7 +140,7 @@ def s3_server():
     port = 5555
     endpoint_uri = f"http://127.0.0.1:{port}/"
     proc = subprocess.Popen(
-        shlex.split(f"moto_server s3 -p {port}"),
+        shlex.split(f"moto_server -p {port}"),
         stderr=subprocess.DEVNULL,
         stdout=subprocess.DEVNULL,
     )