Bump syncfusion_flutter_calendar and syncfusion_flutter_datepicker

Bumps [syncfusion_flutter_calendar](https://github.com/syncfusion/flutter-widgets/tree/master/packages) and [syncfusion_flutter_datepicker](https://github.com/syncfusion/flutter-widgets/tree/master/packages). These dependencies needed to be updated together.

Updates `syncfusion_flutter_calendar` from 27.2.5 to 28.2.3
- [Release notes](https://github.com/syncfusion/flutter-widgets/releases)
- [Commits](https://github.com/syncfusion/flutter-widgets/commits/HEAD/packages)

Updates `syncfusion_flutter_datepicker` from 27.2.5 to 28.2.3
- [Release notes](https://github.com/syncfusion/flutter-widgets/releases)
- [Commits](https://github.com/syncfusion/flutter-widgets/commits/HEAD/packages)

---
updated-dependencies:
- dependency-name: syncfusion_flutter_calendar
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: syncfusion_flutter_datepicker
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

pubspec.lock

@@ -1478,26 +1478,26 @@ packages:
     dependency: "direct main"
     description:
       name: syncfusion_flutter_calendar
-      sha256: "20118a598cf5ae5b7ec84fa364e2b51070800f078466158fcd25864e1b5a2cfd"
+      sha256: ef6cd3f6bcfdd21ea77d5c889bb13fa6bf46ed5a0724f5d545cb43da67e9f1e2
       url: "https://pub.dev"
     source: hosted
-    version: "27.2.5"
+    version: "28.2.3"
   syncfusion_flutter_core:
     dependency: transitive
     description:
       name: syncfusion_flutter_core
-      sha256: "325f519ce4ad8edd81811c21b853d72018529e353584490824da0555156ba076"
+      sha256: "213ada2c3b3555a73cb0eb1530d24d27dcf1a0a1555c0f00dd3e1486b01878ad"
       url: "https://pub.dev"
     source: hosted
-    version: "27.2.5"
+    version: "28.2.3"
   syncfusion_flutter_datepicker:
     dependency: "direct main"
     description:
       name: syncfusion_flutter_datepicker
-      sha256: "2177e49eb8a1c0fce7081e40f5613c986d00e5e63cbeb98a6012f65ca156bfc7"
+      sha256: "9d2694d618d081c9477402175ff027936f60ac053d0989ca02ee65b2e27a65c7"
       url: "https://pub.dev"
     source: hosted
-    version: "27.2.5"
+    version: "28.2.3"
   synchronized:
     dependency: transitive
     description:
@@ -1541,10 +1541,10 @@ packages:
     dependency: transitive
     description:
       name: timezone
-      sha256: "2236ec079a174ce07434e89fcd3fcda430025eb7692244139a9cf54fdcf1fc7d"
+      sha256: ffc9d5f4d1193534ef051f9254063fa53d588609418c84299956c3db9383587d
       url: "https://pub.dev"
     source: hosted
-    version: "0.9.4"
+    version: "0.10.0"
   timing:
     dependency: transitive
     description:

pubspec.yaml

@@ -71,8 +71,8 @@ dependencies:
   shimmer: ^3.0.0
   social_share: ^2.2.1
   stack_trace: ^1.11.1
-  syncfusion_flutter_calendar: ^27.2.5
-  syncfusion_flutter_datepicker: ^27.2.5
+  syncfusion_flutter_calendar: ^28.2.3
+  syncfusion_flutter_datepicker: ^28.2.3
   timelines: ^0.1.0
   tutorial_coach_mark: ^1.2.12
   url_launcher: ^6.3.1