Bump release workflow's Node to 22 - pnpm 11 needs it to even run

pnpm 11.21.0 (pinned in packageManager) now uses node:sqlite
internally, which requires Node >=22.13 - unrelated to this project's
own engines.node: >=20 floor for end users. With node-version: 20 the
runner's pnpm binary couldn't execute at all (ERR_UNKNOWN_BUILTIN_MODULE
on the first pnpm invocation inside actions/setup-node's cache-path
detection), before ever reaching the actual lint/build/publish steps.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -17,7 +17,7 @@ jobs:
 
       - uses: https://github.com/actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: pnpm
           registry-url: https://dev.pivoine.art/api/packages/valknar/npm/