Name release branches just after major.minor (#10013)

With the prior format, 1.33.0 / 1.33.1 / 1.33.2 got separate branches:

    release-v1.33.0
    release-v1.33.1
    release-v1.33.2

Under the new model, all three would share a common branch:

    release-v1.33

As before, RCs and actual releases exist as tags on these branches.

This better reflects our support model, e.g., that the "1.33" series had
a formal release followed by two patches / updates.

Signed-off-by: Dan Callahan <danc@element.io>

scripts-dev/release.py

@@ -139,7 +139,7 @@ def run():
         click.get_current_context().abort()
 
     # Switch to the release branch.
-    release_branch_name = f"release-v{base_version}"
+    release_branch_name = f"release-v{current_version.major}.{current_version.minor}"
     release_branch = find_ref(repo, release_branch_name)
     if release_branch:
         if release_branch.is_remote():