compile-rocm.yaml: update to newer Github actions versions

Per
https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/,
update to use newer versions of github actions so that we stop getting
warnings about outdated Node.js versions.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

Author: jsquyres

.github/workflows/compile-rocm.yaml

@@ -18,7 +18,7 @@ jobs:
         echo 'deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/rocm-keyring.gpg]  https://repo.radeon.com/rocm/apt/debian focal main' | sudo tee /etc/apt/sources.list.d/rocm.list
         sudo apt-get update
         sudo apt-get install -y rocm-hip-sdk
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
             submodules: recursive
     - name: Build Open MPI