fix(pypi): ERROR: Invalid requirement: "'twine<6.2.0'" (#1721)

fix: ERROR: Invalid requirement: "'twine<6.2.0'"

#1716 attempted to pin the Twine version as a hotfix to the `--skip-existing` error with Code Artifact. 

The escaping ended up being wrong. This time I tested it.

Author: mrgrain

bin/publib-pypi

@@ -40,7 +40,7 @@ fi
 upload_opts="--verbose --skip-existing"
 
 # Install required packages
-packages="'twine<6.2.0'"
+packages="twine<6.2.0"
 if [ -n "${PYPI_TRUSTED_PUBLISHER:-}" ]; then
   packages="$packages id"