Merge branch 'opensource-program-join' into 'master'

Docs: update Open Source Program URL

See merge request gitlab-org/gitlab!32287

doc/subscriptions/index.md

@@ -173,7 +173,7 @@ Find more information how to apply and renew at
 
 ## GitLab for Open Source subscriptions
 
-All [GitLab for Open Source](https://about.gitlab.com/solutions/open-source/join/)
+All [GitLab for Open Source](https://about.gitlab.com/solutions/open-source/)
 requests, including subscription renewals, must be made by using the application process.
 If you have any questions, send an email to `opensource@gitlab.com` for assistance.