Auto merge of #323 - dtolnay-contrib:checkoutv3, r=Amanieu

Update GitHub Actions actions/checkout@v2 to v3

The v2 implementation uses Node 12, which is end-of-life on April 30, 2022. See https://nodejs.org/en/about/releases/. Update to v3, which is based on Node 16 whose support lasts until April 30, 2024.

They made this a major version change (v2 to v3) because old GitHub Enterprise versions aren't necessarily compatible with Node 16, but for github.com-supplied runners (SaaS) there is no practical difference.

Author: bors

.github/workflows/rust.yml

@@ -11,23 +11,23 @@ jobs:
   miri:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - env:
         TARGET: x86_64-unknown-linux-gnu
       run: sh ci/miri.sh
 
   rustfmt_clippy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - env:
         TARGET: i586-unknown-linux-gnu
       run: sh ci/tools.sh
 
   test:
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions-rs/toolchain@v1
       with:
         toolchain: ${{ matrix.channel }}