Update CI

Author: jeroen

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

@@ -17,11 +17,12 @@ jobs:
       matrix:
         config:
           - {os: windows-latest, r: '4.1'}
-          - {os: windows-latest, r: '4.2', FORCE_STATIC_GIFSKI: 'static''}
+          - {os: windows-latest, r: '4.2', FORCE_STATIC_GIFSKI: 'static'}
           - {os: windows-latest, r: '4.2'}
           - {os: windows-latest, r: 'release'}
           - {os: windows-latest, r: 'release', FORCE_STATIC_GIFSKI: 'static'}
-          - {os: macOS-latest, r: 'release'}
+          - {os: macOS-13, r: 'release'}
+          - {os: macOS-14, r: 'release'}
           - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
           - {os: ubuntu-latest,   r: 'release'}
 
@@ -30,7 +31,7 @@ jobs:
       R_KEEP_PKG_SOURCE: yes
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-r@v2
         with: