Merge bitcoindevkit#1749: chore: Revert rustls pin dependency

8e5a7c6 chore: Revert `rustls` pin dependency (志宇)

Pull request description:

  ### 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:
  * bitcoindevkit/rust-electrum-client#158
  * rustls/rustls#2244

  ### Changelog notice

  * Revert MSRV pin of `rustls`.

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  LagginTimes:
    ACK 8e5a7c6
  ValuedMammal:
    ACK 8e5a7c6

Tree-SHA512: 355291f93a879effc8aa1d7fe0254d8f879f26d06f0d6b0ad3d7a508a53179f7c5b9ebcd2d450ee042fbd2867119cf9a15c3193af6f36c3e5548634ce689cdca

.github/workflows/cont_integration.yml

@@ -51,7 +51,6 @@ jobs:
           cargo update -p tokio-util --precise "0.7.11"
           cargo update -p indexmap --precise "2.5.0"
           cargo update -p security-framework-sys --precise "2.11.1"
-          cargo update -p [email protected] --precise "0.23.17"
       - name: Build
         run: cargo build --workspace --exclude 'example_*' ${{ matrix.features }}
       - name: Test

README.md

@@ -78,7 +78,6 @@ cargo update -p tokio --precise "1.38.1"
 cargo update -p tokio-util --precise "0.7.11"
 cargo update -p indexmap --precise "2.5.0"
 cargo update -p security-framework-sys --precise "2.11.1"
-cargo update -p [email protected] --precise "0.23.17"
 ```
 
 ## License