update MSRV to 1.81 (#1534)

* ci: update MSRV to 1.81

* update Cargo.toml

* fix nits

.github/workflows/ci.yml

@@ -107,12 +107,12 @@ jobs:
 
       - uses: actions/[email protected]
 
-      - name: Install Rust 1.74.0 toolchain
+      - name: Install Rust 1.81.0 toolchain
         uses: actions-rs/[email protected]
         with:
           profile: minimal
-          # Check that tests pass using our MSRV
-          toolchain: 1.74.0
+          # Check that jsonrpsee compiles with MSRV
+          toolchain: 1.81
           override: true
 
       - name: Rust Cache

Cargo.toml

@@ -22,7 +22,7 @@ resolver = "2"
 authors = ["Parity Technologies <[email protected]>", "Pierre Krieger <[email protected]>"]
 version = "0.24.7"
 edition = "2021"
-rust-version = "1.74.0"
+rust-version = "1.81.0"
 license = "MIT"
 repository = "https://github.com/paritytech/jsonrpsee"
 documentation = "https://docs.rs/jsonrpsee"