fix(ci): make zip reproducibility per-version, not per-commit

Pinning entry timestamps to the commit date made two builds of the same
VERSION differ whenever the workflow failed late and was re-run from a
fix-up commit — the no-overwrite guard then rejected the rerun. Pin to a
fixed epoch (SOURCE_DATE_EPOCH overridable) and walk files in sorted
order so every runner emits identical bytes for a given version. Bump
to 0.2.2 because the 0.2.1 immutable slot holds a commit-time-stamped
build.

package.json

@@ -2,7 +2,7 @@
   "name": "yakit-chrome-client",
   "description": "Yakit Browser Extension",
   "private": true,
-  "version": "0.2.1",
+  "version": "0.2.2",
   "type": "module",
   "packageManager": "[email protected]",
   "scripts": {