chore: Update SDK

pubspec.lock

@@ -364,7 +364,7 @@ packages:
       name: fluffybox
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.4"
+    version: "0.3.5"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -783,7 +783,7 @@ packages:
       name: matrix
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.7.0-nullsafety.8"
+    version: "0.7.0-nullsafety.9"
   matrix_api_lite:
     dependency: transitive
     description:

pubspec.yaml

@@ -48,7 +48,7 @@ dependencies:
   intl: any
   localstorage: ^4.0.0+1
   lottie: ^1.2.1
-  matrix: ^0.7.0-nullsafety.8
+  matrix: ^0.7.0-nullsafety.9
   matrix_link_text: ^1.0.2
   open_noti_settings: ^0.2.0
   package_info_plus: ^1.2.1