[ci] Use newer Ubuntu (and thus compilers) when testing against dune master

requested review from @mathis

assigned to @timok

added 1 commit

• 35d1ac54 - [ci] Use newer Ubuntu (and thus compilers) when testing against dune master

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The pipeline that was previously using gcc-12 with dune master to test C++20 should now automatically using gcc-14 since it's now running ubuntu 24.04.

added Dev / CI label

approved this merge request

merged

mentioned in commit 3b3fac14