Update Doxygen documentation submodule.

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Status Job ID Name Coverage
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passed #7358
clang debug kdeorg/ci-suse-qt511

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passed #7360
clang release kdeorg/ci-suse-qt511

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passed #7357
gcc debug kdeorg/ci-suse-qt511

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passed #7359
gcc release kdeorg/ci-suse-qt511

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