Update react-native-material-palette metadata (#2263)

* Initial plan

* Remove unmaintained flag from react-native-material-palette

Co-authored-by: satya164 <1174278+satya164@users.noreply.github.com>

* Remove unmaintained flag from react-native-material-palette in check-data.json

Co-authored-by: satya164 <1174278+satya164@users.noreply.github.com>

* Remove ios: true from react-native-material-palette (Android-only library)

Co-authored-by: satya164 <1174278+satya164@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: satya164 <1174278+satya164@users.noreply.github.com>

Author: Copilot

assets/check-data.json

@@ -1242,7 +1242,6 @@
     "newArchitecture": "untested"
   },
   "react-native-material-palette": {
-    "unmaintained": true,
     "newArchitecture": "supported"
   },
   "react-native-onboarding-swiper": {

react-native-libraries.json

@@ -2320,9 +2320,7 @@
   },
   {
     "githubUrl": "https://github.com/callstack/react-native-material-palette",
-    "ios": true,
-    "android": true,
-    "unmaintained": true
+    "android": true
   },
   {
     "githubUrl": "https://github.com/jfilter/react-native-onboarding-swiper",