Track-only source bugfix + better http errors

+ increment version

lib/app_sources/apkmirror.dart

@@ -46,7 +46,7 @@ class APKMirror extends AppSource {
       }
       return APKDetails(version, [], getAppNames(standardUrl));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 

lib/app_sources/fdroid.dart

@@ -54,7 +54,7 @@ class FDroid extends AppSource {
       return APKDetails(latestVersion, apkUrls,
           AppNames(name, Uri.parse(standardUrl).pathSegments.last));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 

lib/app_sources/fdroidrepo.dart

@@ -80,7 +80,7 @@ class FDroidRepo extends AppSource {
           .toList();
       return APKDetails(latestVersion, apkUrls, AppNames(authorName, appName));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 }

lib/app_sources/gitlab.dart

@@ -59,7 +59,7 @@ class GitLab extends AppSource {
       }
       return APKDetails(version, apkUrls, GitHub().getAppNames(standardUrl));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 }

lib/app_sources/mullvad.dart

@@ -43,7 +43,7 @@ class Mullvad extends AppSource {
           ['https://mullvad.net/download/app/apk/latest'],
           AppNames(name, 'Mullvad-VPN'));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 }

lib/app_sources/signal.dart

@@ -33,7 +33,7 @@ class Signal extends AppSource {
       }
       return APKDetails(version, apkUrls, AppNames(name, 'Signal'));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 }

lib/app_sources/sourceforge.dart

@@ -57,7 +57,7 @@ class SourceForge extends AppSource {
           AppNames(
               name, standardUrl.substring(standardUrl.lastIndexOf('/') + 1)));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 }

lib/app_sources/steammobile.dart

@@ -54,7 +54,7 @@ class SteamMobile extends AppSource {
       var apkUrls = [links[0]];
       return APKDetails(version, apkUrls, AppNames(name, apks[apkNamePrefix]!));
     } else {
-      throw NoReleasesError();
+      throw getObtainiumHttpError(res);
     }
   }
 }