remove package:http from package:intl

[devoncarew]

• remove package:http from package:intl
• run dart pub run downgrade --tighten

This uses fetch from package:web directly instead of using package:http. This works in this case - the library in question (lib/src/http_request_data_reader.dart) is only ever called from the browser.

This PR moves the package to a -wip version; we'll likely want to follow this up with a PR looking to in-line uses of package:web (assuming that that's a tractable amount of code).

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[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
intl	Non-Breaking	0.20.1	0.20.2-wip	0.20.2	✔️

Changelog Entry ✔️

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

Coverage ⚠️

File	Coverage
pkgs/intl/lib/date_symbol_data_http_request.dart	💔 Not covered
pkgs/intl/lib/src/http_request_data_reader.dart	💔 Not covered

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API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols
intl	StringStack DateBuilder

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License Headers ✔️

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