chore(renovate): hold python 3.15 until onnxruntime publishes py3.15 wheels

fastembed (all versions <1) requires onnxruntime>=1.24.2 on python>=3.14,
but onnxruntime publishes no cp315 wheels yet (latest 1.31.0: cp311/cp312 only).
results in ResolutionImpossible on any py3.15 install, i.e. red CI on PR #55.

Pin allowedVersions to 3.14.x on the python (github-tags) dep so Renovate
stops re-proposing 3.15. Remove this rule once onnxruntime ships 3.15 wheels.

renovate.json

@@ -1,5 +1,13 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "packageRules": [
+    {
+      "description": "Hold python (actions/setup-python) at 3.14 until onnxruntime publishes py3.15 wheels — fastembed requires onnxruntime>=1.24.2 on py>=3.14 and there is no cp315 distribution yet (PR #55 CI: ResolutionImpossible). Re-evaluate once onnxruntime ships 3.15 wheels, then remove this rule.",
+      "matchDepNames": ["python"],
+      "matchDatasources": ["github-tags"],
+      "allowedVersions": "/^3\\.1[0-4](\\.|$)/"
+    }
+  ],
   "customManagers": [
     {
       "customType": "regex",