chore: Revert rustls pin dependency

[evanlinjin]

Description

The recent release of rustls (0.23.19) reverts it's MSRV to 1.63 so the pin is no longer necessary.

Notes to the reviewers

Some context:

• chore: Enforce min rustls version to 0.23.19 rust-electrum-client#158
• Prepare 0.23.19 rustls/rustls#2244

Changelog notice

• Revert MSRV pin of rustls.

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

[LagginTimes]

ACK 8e5a7c6

[LagginTimes]

Since the release notes for 0.23.19 specify that all subsequent releases (0.23.20 and beyond) will have a MSRV of at least 1.71, would it be better to pin our CI to version 0.23.19?

[evanlinjin]

Since the release notes for 0.23.19 specify that all subsequent releases (0.23.20 and beyond) will have a MSRV of at least 1.71, would it be better to pin our CI to version 0.23.19?

I think that will only make sense once we have a release that is > 0.23.18. Otherwise, pining to 0.23.19 will look like this:

cargo update -p [email protected] --precise "0.23.19"

[ValuedMammal]

ACK 8e5a7c6