Fix Renovate lookup: update setup-captain version comment (#4999)

The SHA pin comment referenced `# v1`, but rwx-research/setup-captain
has no rolling v1 tag (only specific versions like v1.4.1). This caused
Renovate to fail with "Could not determine new digest for update."

The SHA itself is unchanged -- only the comment is corrected to reflect
the actual tagged version (v1.4.1) so Renovate can track updates.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: bryanbeverly

.github/workflows/detector-tests.yml

@@ -20,7 +20,7 @@ jobs:
         uses: jaxxstorm/action-install-gh-release@25e24d2d23ae098373794ef1d6faecb48ee52da8 # v3.0.0
         with:
           repo: gotestyourself/gotestsum
-      - uses: rwx-research/setup-captain@f761ee3671e4c027299f8a5842a53fba8ddd8e37 # v1
+      - uses: rwx-research/setup-captain@f761ee3671e4c027299f8a5842a53fba8ddd8e37 # v1.4.1
       - name: Test Go
         run: |
           export CGO_ENABLED=1