github-actions: bump vmactions/freebsd-vm from 1.4.5 to 1.4.6

Bumps [vmactions/freebsd-vm](https://github.com/vmactions/freebsd-vm) from 1.4.5 to 1.4.6.
- [Release notes](https://github.com/vmactions/freebsd-vm/releases)
- [Commits](d1e6581156...a6de9343ef)

---
updated-dependencies:
- dependency-name: vmactions/freebsd-vm
  dependency-version: 1.4.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/builds.yml

@@ -3390,7 +3390,7 @@ jobs:
         with:
           name: prep
           path: prep
-      - uses: vmactions/freebsd-vm@d1e65811565151536c0c894fff74f06351ed26e6
+      - uses: vmactions/freebsd-vm@a6de9343ef5747433d9c25784c90e84998b9d69a
         with:
           release: "15.0"
           arch: x86_64