remove mention of staging in workflow docs (#1080)

the staging environment no longer exists

src/docs/workflow.mdx

@@ -7,17 +7,7 @@ You may also be interested in <Link to="/sentry-vs-getsentry/">sentry vs. getsen
 
 ## Testing Sentry commits in Getsentry
 
-**If you need to deploy to a staging environment**: use
-`./bin/bump-sentry <sha>` to update the committed version.  Note that this will
-likely create a merge conflict so you'll want to merge just before updating:
-
-```bash
-git pull origin HEAD --rebase
-./bin/bump-sentry deadbeef
-git push origin HEAD -f
-```
-
-**If you only need to validate CI**: When you create a PR add `requires <PR link>`
+When you create a PR add `requires <PR link>`
 to the body of it. The `getsentry/action-get-dependent-pr` github action will
 pick up this value and update the sentry revision during CI.  This is meant as
 a temporary measure to quickly validate a change -- one should commit backward