Use specific build number 253.25908.13 for 2025.3 EAP

- Change to actual available build number from JetBrains EAP releases
- This build number exists for IU (Ultimate) platform
- Should resolve platform dependency resolution issues

Author: aseemxs

buildSrc/src/main/kotlin/software/aws/toolkits/gradle/intellij/IdeVersions.kt

@@ -156,11 +156,11 @@ object IdeVersions {
         Profile(
             name = "2025.3",
             gateway = ProductProfile(
-                sdkVersion = "2025.3-EAP-SNAPSHOT",
+                sdkVersion = "253.25908.13",
                 bundledPlugins = listOf("org.jetbrains.plugins.terminal")
             ),
             community = ProductProfile(
-                sdkVersion = "2025.3-EAP-SNAPSHOT",
+                sdkVersion = "253.25908.13",
                 bundledPlugins = commonPlugins + listOf(
                     "com.intellij.java",
                     "com.intellij.gradle",
@@ -176,7 +176,7 @@ object IdeVersions {
                 )
             ),
             ultimate = ProductProfile(
-                sdkVersion = "2025.3-EAP-SNAPSHOT",
+                sdkVersion = "253.25908.13",
                 bundledPlugins = commonPlugins + listOf(
                     "JavaScript",
                     "JavaScriptDebugger",