upgrade dependencies

pubspec.yaml

@@ -6,14 +6,14 @@ author: Leon Tappe <ltappe@asta.upb.de>
 homepage: https://asta.upb.de/
 
 environment:
-  sdk: '>=2.3.0 <3.0.0'
+  sdk: '>=2.6.0 <3.0.0'
 
 dependencies:
   logging: ^0.11.4
-  bloc: ^6.0.0
-  http: ^0.12.0+4
-  meta: ^1.1.8
+  bloc: ^6.1.1
+  http: ^0.12.2
+  meta: ^1.2.4
 
 dev_dependencies:
-  test: ^1.5.2
-  pedantic: ^1.9.0
+  test: ^1.15.7
+  pedantic: ^1.9.2