Update dependency http to v1.5.0

| datasource | package | from  | to    |
| ---------- | ------- | ----- | ----- |
| dart       | http    | 1.2.2 | 1.5.0 |

Author: renovate[bot]

check_urls/pubspec.yaml

@@ -6,4 +6,4 @@ environment:
   sdk: '>=2.14.0 <3.0.0'
 
 dependencies:
-  http: 1.2.2
+  http: 1.5.0