ci: remove unnecessary Rust installation step

windows-latest image already contains Rust 1.67.0.

.github/workflows/repl.yml

@@ -13,12 +13,6 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Install Rust
-      uses: actions-rs/toolchain@v1
-      with:
-        toolchain: 1.66.0
-        override: true
-
     - name: build
       run: cargo build -p deltachat-repl --features vendored