ci(deps): label Lemonade bump PRs and request maintainer reviews (#1573)

The Lemonade auto-bump workflow (#1552) opened its first real PR (#1571,
v10.2.0 → v10.7.0) tagged only `dependencies` and with no reviewers, so
bump PRs don't surface to the platform owners and miss the team's
Lemonade triage label. This adds the `lemonade 🍋` label and requests
both `kovtcharov-amd` and `itomek-amd` on every bump PR the workflow
opens.

Verified end-to-end: applied the same label + reviewers to the live test
PR #1571 via `gh pr edit` (the bot author can request both — confirms
the runtime `gh pr create --reviewer` path works), and both are repo
collaborators.

## Test plan
- [x] `lemonade 🍋` is the exact label name (space + emoji) — `gh label
list`
- [x] `kovtcharov-amd` and `itomek-amd` are collaborators (review
requests won't fail)
- [x] YAML parses
- [ ] Next scheduled/forced run opens a bump PR carrying both labels +
both reviewers

Co-authored-by: Ovtcharov <kovtchar@amd.com>

Author: kovtcharov-amd

.github/workflows/lemonade-version-bump.yml

@@ -205,8 +205,12 @@ jobs:
               --body-file /tmp/pr-body.md \
               --base main \
               --head ${{ steps.detect.outputs.branch }} \
-              --label dependencies
+              --label dependencies \
+              --label "lemonade 🍋" \
+              --reviewer kovtcharov-amd,itomek-amd
             ```
+            The label "lemonade 🍋" includes a space and an emoji — keep it quoted exactly.
+            Both reviewers are required on every bump PR.
 
             PR body (/tmp/pr-body.md) — keep it tight, lead with impact:
             ```