WIP: async-signature: bring rustc beta for AFIT support

Author: baloo

.github/workflows/async-signature.yml

@@ -23,8 +23,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.60.0 # MSRV
-          - stable
+          - beta
     steps:
       - uses: actions/checkout@v4
       - uses: RustCrypto/actions/cargo-cache@master

.github/workflows/workspace.yml

@@ -26,7 +26,7 @@ jobs:
       - uses: RustCrypto/actions/cargo-cache@master
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.73.0
+          toolchain: beta
           components: clippy
       - run: cargo clippy --all --all-features --tests -- -D warnings
 
@@ -36,6 +36,6 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: stable
+          toolchain: beta
           components: rustfmt
       - run: cargo fmt --all -- --check