Update GitHub actions workflows

.github/workflows/R-CMD-check.yaml

@@ -16,7 +16,7 @@ jobs:
   R-CMD-check:
     runs-on: ${{ matrix.config.os }}
 
-    name: ${{ matrix.config.os }} (tf-${{ matrix.config.tf }}, R-${{ matrix.config.r }})
+    name: ${{ matrix.config.os }} (R-${{ matrix.config.r }})
 
     strategy:
       fail-fast: false
@@ -30,17 +30,14 @@ jobs:
           - {os: 'ubuntu-latest', r: 'release'}
           - {os: 'ubuntu-latest', r: 'oldrel-1'}
           - {os: 'ubuntu-latest', r: 'oldrel-2'}
-          - {os: 'ubuntu-latest', r: 'oldrel-3'}
-          - {os: 'ubuntu-latest', r: 'oldrel-4'}
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       TORCH_TEST: 1
       TORCH_INSTALL: 1
       TORCH_COMMIT_SHA: "none"
-      CC: gcc-14
-      CXX: g++-14
+      PYTORCH_ENABLE_MPS_FALLBACK: 1
 
     steps:
       - uses: actions/checkout@v3
@@ -64,7 +61,7 @@ jobs:
         shell: Rscript {0}
 
       - name: Install Tensorflow + Keras deps
-        run: keras::install_keras(tensorflow = '${{ matrix.config.tf }}-cpu')
+        run: keras::install_keras(tensorflow = 'default-cpu')
         shell: Rscript {0}
 
       - name: Check if torch is installed
@@ -80,4 +77,5 @@ jobs:
       - uses: r-lib/actions/check-r-package@v2
         with:
           error-on: '"error"'
+          args: 'c("--no-multiarch", "--no-manual", "--as-cran")'
           upload-snapshots: true