chore(rootfs/Dockerfile): update shfmt to v3.3.0 (#301)

See https://github.com/mvdan/sh/releases/tag/v3.3.0

Author: mboersma

rootfs/Dockerfile

@@ -17,7 +17,7 @@ ENV ANSIBLE_VERSION=2.10.3 \
     PYJWT_VERSION=2.1.0 \
     PYWINRM_VERSION=0.4.1 \
     SHELLCHECK_VERSION=v0.7.2 \
-    SHFMT_VERSION=3.2.4 \
+    SHFMT_VERSION=3.3.0 \
     UPX_VERSION=3.96 \
     PATH=$PATH:/usr/local/go/bin:/go/bin:/usr/local/bin/docker \
     GOPATH=/go