ci: upgrade to macos-14

Author: aapoalas

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
       matrix:
         os:
           [
-            "macos-13",
+            "macos-14",
             "macos-latest",
             "ubuntu-24.04-arm",
             "ubuntu-latest",

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
             asset-name: nova-linux-arm64
 
           # macOS (Intel)
-          - os: macos-13
+          - os: macos-14
             rust-target: x86_64-apple-darwin
             asset-name: nova-macos-amd64