deps: bump dvx to 6156acc0b (stop walking past fresh artifacts)

Pulls in two relevant fixes:
- `4d2562c18` `dvx run`: stop walking upstream past fresh artifacts
- `814e11379` `get_dep_hashes`: fall back to recorded md5 when dep file
  is absent

Together these mean CI no longer needs to pull transitively-checked-only
deps (e.g. per-year AASHTO `crashes.parquet`) — `dvx run` trusts the
on-disk md5 of a fresh artifact and stops recursing into its tree.

Author: ryan-williams

pyproject.toml

@@ -16,7 +16,7 @@ dependencies = [
     "dask>=2024",
     "dotenv>=0.9.9",
     "dvc[s3]>=3.59",
-    "dvx @ git+https://github.com/runsascoded/dvx@5d0f13896",
+    "dvx @ git+https://github.com/runsascoded/dvx@6156acc0b",
     "geopandas>=1.0",
     "geopy>=2.4",
     "GitPython>=3.1",