Trying to fix macOS checks

Author: davidrsch

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

@@ -41,7 +41,6 @@ jobs:
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       R_KEEP_PKG_SOURCE: yes
-      OMP_NUM_THREADS: 1
 
     steps:
       - uses: actions/checkout@v4
@@ -81,7 +80,7 @@ jobs:
       - name: Install Keras backend
         # The keras3 package is installed by the previous step (as a dependency)
         # This step installs the required Python libraries (e.g., tensorflow).
-        run: keras3::install_keras()
+        run: keras3::install_keras(envname = "r-reticulate")
         shell: Rscript {0}
 
       - uses: r-lib/actions/check-r-package@v2