.build.yml: Use poetry in SourceHut CI

.build.yml

@@ -1,19 +1,16 @@
 image: archlinux
 packages:
-  - python-pipenv
+  - python-poetry
 sources:
   - https://git.sr.ht/~alanorth/csv-metadata-quality
 tasks:
   - setup: |
       cd csv-metadata-quality
-      pipenv install --dev
+      poetry install --dev
   - pytest: |
       cd csv-metadata-quality
-      pipenv run pytest
+      poetry run pytest
   - testcli: |
       cd csv-metadata-quality
-      pipenv run pip install .
-      pipenv run csv-metadata-quality -i data/test.csv -o /tmp/test.csv -e -u --agrovoc-fields dc.subject,cg.coverage.country
-environment:
-  PIPENV_NOSPIN: 'True'
-  PIPENV_HIDE_EMOJIS: 'True'
+      poetry run pip install .
+      poetry run csv-metadata-quality -i data/test.csv -o /tmp/test.csv -e -u --agrovoc-fields dc.subject,cg.coverage.country