Bump macOS and FreeBSD versions in CI

.github/workflows/ci.yml

@@ -157,17 +157,17 @@ jobs:
         path: fvcbm
 
   osx-12-x86_64:
-    name: 'macOS 12 on x86_64'
-    runs-on: macos-12
+    name: 'macOS 15'
+    runs-on: macos-15
     steps:
     - uses: actions/checkout@v4
-    - name: 'Compile with gcc on x86_64'
+    - name: 'Compile with gcc'
       run: make linux
-    - name: 'Run tests with gcc on x86_64'
+    - name: 'Run tests with gcc'
       run: make test
-    - name: 'Compile fat binary with gcc on x86_64'
+    - name: 'Compile fat binary with gcc'
       run: make clean && make linux LINUX_CC=cc LINUX_CFLAGS='-O2 -DUNIX -arch arm64 -arch x86_64'
-    - name: 'Run tests with fat binary with gcc on x86_64'
+    - name: 'Run tests with fat binary with gcc'
       run: make test
     - name: 'Strip binary'
       run: strip fvcbm
@@ -193,15 +193,15 @@ jobs:
       run: make test
 
   freebsd-13:
-    name: 'FreeBSD 13.3 on x86_64'
+    name: 'FreeBSD 13.4 on x86_64'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: 'build & test on FreeBSD'
         uses: cross-platform-actions/action@v0.25.0
         with:
           operating_system: "freebsd"
-          version: "13.3"
+          version: "13.4"
           architecture: "x86_64"
           run: |
             # heirloom-tools has the original nroff, but it isn't working with -man