fix: add environment 'pypi' to Publish_Package job for trusted publishing

PyPI trusted publisher OIDC token exchange failed because the workflow
job did not declare a GitHub environment. PyPI's trusted publisher config
requires environment claim to match. Added environment: pypi to the
Publish_Package job in Release.yml.

Author: mihakralj

.github/workflows/Release.yml

@@ -173,6 +173,7 @@ jobs:
   Publish_Package:
     needs: [Build_Python_Wheels]
     runs-on: ubuntu-latest
+    environment: pypi
     timeout-minutes: 15
     permissions:
       contents: write