fix: use a minimum of Dart 3.4.3 and don't use 'any' for any dep version constraints

We're very inconsistent with marking what Flutter and Dart versions we support. The .fvmrc indicates
Flutter 3.27.4 which comes with Dart 3.6.2, but the packages said 3.0 and 3.1.
This commit brings all versions in line and sets the minimum to Dart 3.4.3. This version is chosen
so it can be used as is with one of our projects that currently uses that Dart version.

.fvmrc

@@ -1,3 +1,3 @@
 {
-  "flutter": "3.27.4"
+  "flutter": "3.22.2"
 }

packages/flutter_timeline/pubspec.yaml

@@ -7,7 +7,8 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: ">=3.1.3 <4.0.0"
+  sdk: ">=3.4.3 <4.0.0"
+  flutter: ^3.22.2
 
 dependencies:
   flutter:
@@ -19,10 +20,9 @@ dependencies:
   flutter_timeline_interface:
     hosted: https://forgejo.internal.iconica.nl/api/packages/internal/pub
     version: ^5.1.0
-  collection: any
+  collection: ^1.18.0
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis

packages/flutter_timeline_firebase/lib/src/config/firebase_timeline_options.dart

@@ -2,9 +2,6 @@
 //
 // SPDX-License-Identifier: BSD-3-Clause
 
-import 'package:flutter/material.dart';
-
-@immutable
 class FirebaseTimelineOptions {
   const FirebaseTimelineOptions({
     this.usersCollectionName = 'users',

packages/flutter_timeline_firebase/lib/src/models/firebase_user_document.dart

@@ -2,9 +2,6 @@
 //
 // SPDX-License-Identifier: BSD-3-Clause
 
-import 'package:flutter/material.dart';
-
-@immutable
 class FirebaseUserDocument {
   const FirebaseUserDocument({
     this.firstName,

packages/flutter_timeline_firebase/pubspec.yaml

@@ -8,7 +8,8 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: ">=3.1.3 <4.0.0"
+  sdk: ">=3.4.3 <4.0.0"
+  flutter: ^3.22.2
 
 dependencies:
   flutter:
@@ -23,7 +24,6 @@ dependencies:
     version: ^5.1.0
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis

packages/flutter_timeline_interface/pubspec.yaml

@@ -8,14 +8,13 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: '>=3.1.3 <4.0.0'
+  sdk: '>=3.4.3 <4.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis

packages/flutter_timeline_view/pubspec.yaml

@@ -8,15 +8,16 @@ version: 5.1.0
 publish_to: https://forgejo.internal.iconica.nl/api/packages/internal/pub
 
 environment:
-  sdk: ">=3.1.3 <4.0.0"
+  sdk: ">=3.4.3 <4.0.0"
+  flutter: ^3.22.2
 
 dependencies:
   flutter:
     sdk: flutter
-  intl: any
+  intl: ^0.19.0
   cached_network_image: ^3.2.2
   dotted_border: ^2.1.0
-  collection: any
+  collection: ^1.18.0
   flutter_svg: ^2.0.10+1
   flutter_timeline_interface:
     hosted: https://forgejo.internal.iconica.nl/api/packages/internal/pub
@@ -26,7 +27,6 @@ dependencies:
     version: ^4.0.0
 
 dev_dependencies:
-  flutter_lints: ^2.0.0
   flutter_iconica_analysis:
     git:
       url: https://github.com/Iconica-Development/flutter_iconica_analysis

pubspec.yaml

@@ -5,6 +5,6 @@
 name: flutter_timeline_workspace
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: '>=3.4.3 <4.0.0'
 dev_dependencies:
   melos: ^3.0.1