chore(deps): update mcr.microsoft.com/devcontainers/universal docker tag to v6.0.6

Author: renovate[bot]

Dockerfile

@@ -11,7 +11,7 @@
 # Pin a concrete universal image tag (not :latest) for reproducible builds and static analysis (Trivy DS-0001 / Checkov).
 # kics-scan ignore-line
 # hadolint ignore=DL3007
-FROM mcr.microsoft.com/devcontainers/universal:6.0.4-linux
+FROM mcr.microsoft.com/devcontainers/universal:6.0.6-linux
 
 USER codespace
 # kics-scan ignore-line