ci(workflows): remove conflict markers from update-version-tags.yml

`.github/workflows/update-version-tags.yml` has carried literal git
conflict markers in its YAML header since the Mergify auto-backport
in #1988 (cherry-pick of #1984 onto circinus) — the cherry-pick
conflicted, but Mergify's `ignore_conflicts: true` default at the
time committed the markers verbatim into the file. (The central
Mergify config switched to `ignore_conflicts: false` a few days
later as a direct response to this class of incident; #1988 had
already merged.)

Result: GitHub's YAML parser fails on `<<<<<<<` / `=======` /
`>>>>>>>` and the workflow can't schedule any job. Every push to
circinus touching `docs/**` or `context7.json` since #1988 merged
reported "this run likely failed because of a workflow file issue"
with 0 jobs. The downstream `context7-refresh.yml` (which uses
`workflow_run` to react to this workflow's name) also never fired,
so Context7's `1.5` index has been getting stale on every doc push.

Fix: replace the file with rolling's verbatim content. The
post-conflict-marker content on circinus was already byte-identical
to rolling; only the marker block + the obsolete comment block
above it differ. Confirmed with
`diff <(git show origin/rolling:.../update-version-tags.yml) <(...)`
returning empty after stripping markers.

After this merges:
- `Update version tags` runs on every docs-affecting push to
  circinus, moves the `1.5` tag to HEAD.
- `Context7 refresh` fires via `workflow_run` and refreshes the
  `1.5` index.

🤖 Generated by [robots](https://vyos.io)

1 files changed, 0 insertions, 6 deletions

diff --git a/.github/workflows/update-version-tags.yml b/.github/workflows/update-version-tags.yml
index bb8325f2..cf03c57a 100644
--- a/.github/workflows/update-version-tags.yml
+++ b/.github/workflows/update-version-tags.yml
@@ -1,10 +1,5 @@
 name: Update version tags
 
-<<<<<<< HEAD
-# This workflow exists on rolling, circinus, and sagitta.
-# Keep all three copies in sync — backport edits via Mergify
-# (`@Mergifyio backport circinus sagitta`) or cherry-pick.
-=======
 # context7-refresh.yml triggers via workflow_run on this workflow's name.
 # DO NOT rename the `name:` field above without updating context7-refresh.yml.
 #
@@ -16,7 +11,6 @@ name: Update version tags
 # semantically correct — the tag still represents the latest docs state.
 # `context7.json` is included because changes to its `rules`, `folders`, or
 # `excludeFolders` affect what Context7 returns even when no .md files moved.
->>>>>>> 800acbfd (ci(context7): gate version-tag move + refresh on docs-only changes)
 
 on:
   push: