dart is marked for autoremoval from testing

[Debian testing autoremoval watch]

dart 6.12.1+dfsg4-11 is marked for autoremoval from testing on 2022-03-17

It (build-)depends on packages with these RC bugs:
965459: coinor-ipopt: Removal of obsolete debhelper compat 5 and 6 in bookworm
 https://bugs.debian.org/965459



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