Fix unnecessary variables in sentry release job

When they are set on the project level, they will be available in the
job environment, so there is no need to set them explicitly.

.gitlab-ci.yml

@@ -442,11 +442,6 @@ publish-sentry-release:
   image: python:3.11-bookworm
   needs:
     - publish-production
-  variables:
-    SENTRY_AUTH_TOKEN: $SENTRY_AUTH_TOKEN
-    SENTRY_ORG: $SENTRY_ORG
-    SENTRY_PROJECT: $SENTRY_PROJECT
-    SENTRY_URL: $SENTRY_URL
   before_script:
     - pip3 install sentry-cli
   script: