chore(create-release-pr): bump architect to v8.3.0 (RC changelog aggregation) (#243)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: piontec

.github/workflows/create-release-pr.yaml

@@ -210,7 +210,7 @@ jobs:
         with:
           binary: architect
           # renovate: datasource=github-tags depName=giantswarm/architect
-          version: v8.2.1
+          version: v8.3.0
           download_url: "https://github.com/giantswarm/architect/releases/download/${version}/architect-linux-amd64"
       - name: Checkout code
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

CHANGELOG.md

@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 however this project does not use Semantic Versioning and there are no releases.
 Instead this file uses a date-based structure.
 
+## 2026-07-14
+
+### Changed
+
+- `create-release-pr.yaml` — bumped `architect` to `v8.3.0`, which aggregates release-candidate changelogs when promoting to a stable release. On an RC → stable promotion, `architect prepare-release` now merges every `## [X.Y.Z-rc.N]` section into the promoted stable section, so the GitHub release page (built from that version's section) shows the full change set instead of the often-empty delta. No workflow logic is needed — the behavior lives in the binary that already writes `CHANGELOG.md`.
+
 ## 2026-07-07
 
 ### Fixed