Bump actions/cache from 4 to 5

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/update-cache.yml

@@ -24,7 +24,7 @@ jobs:
       # ────────── AutoTST ──────────
       - name: Cache AutoTST
         id: cache-autotst
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: AutoTST
           key: ${{ runner.os }}-autotst-main
@@ -42,7 +42,7 @@ jobs:
       # ────────── TS‑GCN ──────────
       - name: Cache TS-GCN
         id: cache-tsgcn
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: TS-GCN
           key: ${{ runner.os }}-tsgcn-main
@@ -60,7 +60,7 @@ jobs:
       # ────────── KinBot ──────────
       - name: Cache KinBot
         id: cache-kinbot
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: KinBot
           key: ${{ runner.os }}-kinbot-2.0.6