build: consume snowfakery dev prereleases on dev branch

Update snowfakery dependency floor to >=5.0.0.dev1 (prerelease) and
regenerate uv.lock against the published PyPI artifact. This unblocks
dev-to-dev cross-repo integration without waiting for a stable Snowfakery
main release.

3.13 validation: 3216 passed, 37 skipped.
3.14 validation deferred: CumulusCI requires-python <3.14 ceiling still
in place (to be relaxed by the python-314-support branch merge).

Author: jstvz

pyproject.toml

@@ -52,7 +52,7 @@ dependencies = [
     "sarge",
     "selenium<4",
     "simple-salesforce>=1.12.6",
-    "snowfakery>=4.2.1",
+    "snowfakery>=5.0.0.dev1",
     "xmltodict",
     "docutils<=0.21.2",
 ]