docs(Dart-GSoC-2025-Project-Ideas): update GSoC 2025 application status

Closes #60460

GitOrigin-RevId: ae91b4b
Change-Id: I57fc88bc94ed3b3d3653137848e1aa6e5b6efb76
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/419921
Commit-Queue: Daco Harkes <[email protected]>
Reviewed-by: Daco Harkes <[email protected]>

Author: mehdihassan93

docs/gsoc/Dart-GSoC-2025-Project-Ideas.md

@@ -1,6 +1,9 @@
-> [!warning]
-> **Google Summer of Code 2025 is not accepting applications yet**.
+> [!info]
+> **Google Summer of Code 2025 is currently accepting applications until April 8, 2025.**
 
+The list of accepted projects will be announced on [summerofcode.withgoogle.com](https://summerofcode.withgoogle.com/organizations/).
+
+📌 See the [official timeline](https://developers.google.com/open-source/gsoc/timeline) for more details.
 ------
 
 A list of Google Summer of Code project ideas for Dart.