Re-add FreeBSD 13.5

Author: mattjala

.github/workflows/freebsd.yml

@@ -34,7 +34,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        freebsd-version: ['14.3', '15.0']
+        freebsd-version: ['13.5', '14.3', '15.0']
 
     steps:
       - name: Checkout repository