FlatHub: bump metainfo.xml on release (#6578)

* add bump_metainfo.py

* bump org.meshtastic.meshtasticd.metainfo.xml on release

* update bump-version job to trigger on published

* use defusedxml.ElementTree parse

* move bump_metainfo, use requirements.txt

* add bin/bump_metainfo/requirements.txt to renovate

* Switch to short version string

* Bump version.properties to 2.6.6

* change version format

* remove url

* Add url back in

* Update url format

* manual add 2.6.6

* consolidate into one PR

* update run steps

* add ability to add date if missing

* update pull request title

* add comments

* remove quote changes

---------

Co-authored-by: Austin <vidplace7@gmail.com>

renovate.json

@@ -13,6 +13,9 @@
   "git-submodules": {
     "enabled": true
   },
+  "pip_requirements": {
+    "fileMatch": ["bin/bump_metainfo/requirements.txt"]
+  },
   "commitMessageTopic": "{{depName}}",
   "labels": ["dependencies"],
   "customDatasources": {