bump MSRV to 1.64 (#258)

Needed to update system-configuration, among other things.

reqwest is already depending on 1.64, so we don't affect them.

Author: seanmonstar

.github/workflows/CI.yml

@@ -60,7 +60,7 @@ jobs:
     needs: [style]
     strategy:
       matrix:
-        rust: [ 1.63 ] # keep in sync with 'rust-version' in Cargo.toml
+        rust: [ 1.64 ] # keep in sync with 'rust-version' in Cargo.toml
         os:
           - ubuntu-latest
           - windows-latest
@@ -73,7 +73,6 @@ jobs:
       - name: Resolve MSRV aware dependencies
         run: |
           cargo update
-          cargo update system-configuration --precise 0.5.0
         env:
           CARGO_RESOLVER_INCOMPATIBLE_RUST_VERSIONS: fallback
       - name: Install Rust (${{ matrix.rust }})

Cargo.toml

@@ -11,7 +11,7 @@ authors = ["Sean McArthur <sean@seanmonstar.com>"]
 keywords = ["http", "hyper", "hyperium"]
 categories = ["network-programming", "web-programming::http-client", "web-programming::http-server"]
 edition = "2021"
-rust-version = "1.63"
+rust-version = "1.64"
 
 [package.metadata.docs.rs]
 features = ["full"]