ci(msrv): bump rust MSRV to 1.75

- bumps the MSRV on CI to 1.75.
- updates the `Cargo.toml` rust-version to 1.75.
- removes the guideline to pin `rustls` version, as previously required
  by old 1.63 MSRV.
- update `README.md` badges to `1.75` MSRV.
- update `clippy.toml` to `1.75` MSRV.

.github/workflows/cont_integration.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         rust:
           - stable # STABLE
-          - 1.63.0 # MSRV
+          - 1.75.0 # MSRV
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -28,10 +28,6 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: ${{ matrix.rust }}
-      - name: Pin dependencies for MSRV
-        if: matrix.rust == '1.63.0'
-        run: |
-          cargo update -p rustls --precise "0.23.19"
       - name: Test
         run: cargo test --verbose --all-features
       - name: Setup iptables for the timeout test

Cargo.toml

@@ -9,7 +9,7 @@ documentation = "https://docs.rs/electrum-client/"
 description = "Bitcoin Electrum client library. Supports plaintext, TLS and Onion servers."
 keywords = ["bitcoin", "electrum"]
 readme = "README.md"
-rust-version = "1.63.0"
+rust-version = "1.75.0"
 edition = "2021"
 
 # loosely based on https://github.com/evgeniy-scherbina/rust-electrumx-client

README.md

@@ -5,18 +5,11 @@
 [GitHub Workflow]: https://github.com/bitcoindevkit/rust-electrum-client/actions?query=workflow%3ACI
 [Latest Version]: https://img.shields.io/crates/v/electrum-client.svg
 [crates.io]: https://crates.io/crates/electrum-client
-[MSRV Badge]: https://img.shields.io/badge/rustc-1.63.0%2B-lightgrey.svg
-[Rust Blog]: https://blog.rust-lang.org/2022/08/11/Rust-1.63.0.html
+[MSRV Badge]: https://img.shields.io/badge/rustc-1.75.0%2B-lightgrey.svg
+[Rust Blog]: https://blog.rust-lang.org/2023/12/28/Rust-1.75.0.html
 
 Bitcoin Electrum client library. Supports plaintext, TLS and Onion servers.
 
 ## Minimum Supported Rust Version (MSRV)
 
-This library should compile with any combination of features with Rust 1.63.0.
-
-To build with the MSRV you will need to pin dependencies as follows:
-
-```shell
-cargo update -p rustls --precise "0.23.19"
-```
-
+This library should compile with any combination of features with Rust 1.75.0.

clippy.toml

@@ -1 +1 @@
-msrv="1.63.0"
+msrv="1.75.0"