chore(ci): update cherry-pick workflow to fix multi-commit PRs

Updates the cherry-pick workflow reference from plumbing to include
the fix for cherry-picking all commits from rebase-merged PRs.

See: tektoncd/plumbing#3063
Signed-off-by: Vincent Demeester <[email protected]>

Author: vdemeester

.github/workflows/cherry-pick-command.yaml

@@ -27,6 +27,6 @@ permissions:
 jobs:
   cherry-pick:
     name: Cherry Pick Actions
-    uses: tektoncd/plumbing/.github/workflows/_cherry-pick-command.yaml@4b57443b85569e5bb7d9ee440bf5cae99cb642cb
+    uses: tektoncd/plumbing/.github/workflows/_cherry-pick-command.yaml@03501984b53f82be58454f64218ea5c3122b898e
     secrets:
       CHATOPS_TOKEN: ${{ secrets.CHATOPS_TOKEN }}