Update version string for 2023.03-rc to final 2023.04

lib/models/friendica_version.dart

@@ -149,7 +149,7 @@ final FriendicaVersion v2022_12 = FriendicaVersion(DateTime(2022, 12));
 
 // 2023 Versions
 final FriendicaVersion v2023_01 = FriendicaVersion(DateTime(2023, 01));
-final FriendicaVersion v2023_03 = FriendicaVersion(DateTime(2023, 03));
+final FriendicaVersion v2023_04 = FriendicaVersion(DateTime(2023, 04));
 
 final knownFriendicaVersions = [
 //  2018 Versions
@@ -186,7 +186,7 @@ final knownFriendicaVersions = [
 
 // 2023 Versions
   v2023_01,
-  v2023_03,
+  v2023_04,
 ];
 
 FriendicaVersion latestVersion() => knownFriendicaVersions.last;

lib/services/feature_version_checker.dart

@@ -68,10 +68,10 @@ class FriendicaVersionChecker {
       "${feature.label} requires at least Friendica ${getVersionRequirement(feature).toVersionString()}";
 
   static final featureVersionRequirement = <RelaticaFeatures, FriendicaVersion>{
-    RelaticaFeatures.diasporaReshare: v2023_03,
-    RelaticaFeatures.directMessageCreation: v2023_03,
-    RelaticaFeatures.postSpoilerText: v2023_03,
-    RelaticaFeatures.statusEditing: v2023_03,
-    RelaticaFeatures.usingActualFollowRequests: v2023_03,
+    RelaticaFeatures.diasporaReshare: v2023_04,
+    RelaticaFeatures.directMessageCreation: v2023_04,
+    RelaticaFeatures.postSpoilerText: v2023_04,
+    RelaticaFeatures.statusEditing: v2023_04,
+    RelaticaFeatures.usingActualFollowRequests: v2023_04,
   };
 }

test/friendica_version_test.dart

@@ -151,7 +151,7 @@ void main() {
       "2022.10",
       "2022.12",
       "2023.01",
-      "2023.03",
+      "2023.04",
     ];
 
     final versions = [
@@ -212,7 +212,7 @@ void main() {
       v2022_10, // 2022.10
       v2022_12, // 2022.12
       v2023_01, // 2023.01
-      v2023_03, // 2023.03
+      v2023_04, // 2023.04
     ];
 
     expect(versionStrings.length, equals(versions.length));