Upgrade http package

[kaliasdeveloper]

Update the http package in web_scraper's pubspec.yaml to upgrade projects that use both http and web_scraper.

[miguelfs]

same here

Because google_fonts >=4.0.5 depends on http ^1.0.0 and web_scraper >=0.1.2 depends on http ^0.13.0, google_fonts >=4.0.5 is incompatible with web_scraper >=0.1.2.
And because web_scraper <0.1.2 doesn't support null safety, google_fonts >=4.0.5 is incompatible with web_scraper.
So, because my_awesome_app depends on both google_fonts ^6.1.0 and web_scraper any, version solving failed.

The lower bound of "sdk: '>=2.1.0 <3.0.0'" must be 2.12.0 or higher to enable null safety.

[miguelfs]

#99