Automated update of IANA time zone data (#554)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

src/System.Runtime.TimeZoneData/System.Runtime.TimeZoneData.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.Build.NoTargets">
   <PropertyGroup>
-    <TimeZoneDataVersion>2025a</TimeZoneDataVersion>
+    <TimeZoneDataVersion>2025b</TimeZoneDataVersion>
     <TimeZoneDataIntermediateDir>$([MSBuild]::NormalizeDirectory('$(IntermediateOutputPath)', 'timezonedata'))</TimeZoneDataIntermediateDir>
     <TimeZoneDataSrcDir>$([MSBuild]::NormalizeDirectory('$(MSBuildProjectDirectory)', 'data'))</TimeZoneDataSrcDir>
     <ZicBloat>slim</ZicBloat>

src/System.Runtime.TimeZoneData/data/America/Coyhaique

@@ -124,7 +124,8 @@ CH,DE,LI	+4723+00832	Europe/Zurich	Büsingen
 CI,BF,GH,GM,GN,IS,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
 CK	-2114-15946	Pacific/Rarotonga
 CL	-3327-07040	America/Santiago	most of Chile
-CL	-5309-07055	America/Punta_Arenas	Region of Magallanes
+CL	-4534-07204	America/Coyhaique	Aysén Region
+CL	-5309-07055	America/Punta_Arenas	Magallanes Region
 CL	-2709-10926	Pacific/Easter	Easter Island
 CN	+3114+12128	Asia/Shanghai	Beijing Time
 CN	+4348+08735	Asia/Urumqi	Xinjiang Time