chore: Revert rustls pin dependency

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

Author: evanlinjin

.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