Bump stackexchange/dnscontrol from 4.7.4 to 4.8.1

Bumps stackexchange/dnscontrol from 4.7.4 to 4.8.1.

---
updated-dependencies:
- dependency-name: stackexchange/dnscontrol
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM stackexchange/dnscontrol:4.7.4
+FROM stackexchange/dnscontrol:4.8.1
 
 LABEL repository="https://github.com/wblondel/dnscontrol-action"
 LABEL maintainer="William Gérald Blondel <contact@williamblondel.fr>"