Remove PGP signing

common.mk

@@ -30,7 +30,7 @@ release:
 	    if [[ -f Changes.md ]]; then cat $$TAG_MSG <(echo) Changes.md | sponge Changes.md; git add Changes.md; fi; \
 	    if [[ -f Changes.rst ]]; then cat <(pandoc --from markdown --to rst $$TAG_MSG) <(echo) Changes.rst | sponge Changes.rst; git add Changes.rst; fi; \
 	    git commit -m ${TAG}; \
-	    git tag --sign --annotate --file $$TAG_MSG ${TAG}
+	    git tag --annotate --file $$TAG_MSG ${TAG}
 	git push --follow-tags
 	$(MAKE) install
 	gh release create ${TAG} dist/*.whl --notes="$$(git tag --list ${TAG} -n99 | perl -pe 's/^\S+\s*// if $$. == 1' | sed 's/^\s\s\s\s//')"
@@ -39,7 +39,7 @@ release:
 
 release-pypi:
 	python -m build
-	twine upload dist/*.tar.gz dist/*.whl --sign --verbose
+	twine upload dist/*.tar.gz dist/*.whl --verbose
 
 release-docs:
 	$(MAKE) docs