Update ghcr.io/metal-toolbox/ironlib Docker tag to v0.2.18 (#66)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| ghcr.io/metal-toolbox/ironlib | final | patch | `v0.2.12` -> `v0.2.18`
|

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Dockerfile

@@ -1,5 +1,5 @@
 ARG IRONLIB_REPO=ghcr.io/metal-toolbox
-ARG IRONLIB_TAG=v0.2.12@sha256:a4e981d5a3c217cc89a14a02b9663bb47c4746aa0d754bccdcc2b4edd316575f
+ARG IRONLIB_TAG=v0.2.18@sha256:396ef927d48128f76e74a558988d7c05e68b517481a222792cbf891335d8b992
 FROM $IRONLIB_REPO/ironlib:$IRONLIB_TAG as intermediate
 
 COPY --chmod=755 vogelkop /usr/sbin/vogelkop