Update minimum-dependency policy (#2491)

Author: VeckoTheGecko

.github/workflows/additional.yml

@@ -13,9 +13,11 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - uses: astral-sh/setup-uv@v7
+        with:
+          version: "0.9.26"
       - run: |
-          uv run --with 'minimum-dependency-versions @ git+https://github.com/xarray-contrib/minimum-dependency-versions@v1.0.0' \
-          python -m minimum_versions validate \
+          uvx --from xarray-minimum-dependency-policy==2.0.0 \
+          minimum-versions validate \
           --policy=.github/ci/policy.yaml \
           --manifest-path=./pixi.toml \
           pixi:test-minimum
@@ -25,7 +27,6 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
-      - uses: actions/checkout@v5
       - uses: actions/checkout@v5
       - uses: prefix-dev/setup-pixi@v0.9.0
       - run: pixi run docs-linkcheck