Update ci actions

Author: bluss

.github/workflows/ci.yml

@@ -35,12 +35,10 @@ jobs:
             experimental: false
 
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
         with:
-          profile: minimal
           toolchain: ${{ matrix.rust }}
-          override: true
       - name: Pin versions for MSRV
         if: "${{ matrix.rust == '1.51.0' }}"
         run: |
@@ -59,7 +57,7 @@ jobs:
   miri:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Install Miri
         run: |
           rustup toolchain install nightly --component miri