Use newer version of Android Studio and Dart plugin for sandbox testing (flutter#8449)

We've discussed moving over to testing against the latest versions of Android Studio during development instead of this earlier one which we just carried over from before build changes.

I can't tell if this has an impact on the final build, which just includes from/until versions in the `plugin.xml` file.

This isn't for the 87.1 milestone

Author: helin24

build.gradle.kts

@@ -108,6 +108,7 @@ dependencies {
   intellijPlatform {
     // Documentation on the default target platform methods:
     // https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-dependencies-extension.html#default-target-platforms
+    // Android Studio versions can be found at: https://plugins.jetbrains.com/docs/intellij/android-studio-releases-list.html
     androidStudio(ideaVersion)
     testFramework(TestFrameworkType.Platform)
 

gradle.properties

@@ -7,8 +7,8 @@
 # Change to version when releasing, e.g.
 #flutterPluginVersion=87.0.1
 flutterPluginVersion=SNAPSHOT
-ideaVersion=2024.3.1.7
-dartPluginVersion= 243.21565.120
+ideaVersion=2025.1.3.4
+dartPluginVersion= 251.27623.5
 sinceBuild=243
 untilBuild=253.*
 javaVersion=21