loader: Ensure to fetch latest snapshot produced by a hg visit type

SWH data model allows an origin to have multiple visit types, in particular a mercurial origin can have visit types 'hg' and 'hg-checkout'.

We must ensure to retrieve the latest snapshot for a hg visit type in the mercurial loader implementation as it can break incremental loading of a mercurial origin having both visit types mentioned above.

Related to swh/meta#5092.

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• 3e76cd57 - loader: Ensure to fetch latest snapshot produced by a hg visit type

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^ Bump swh.loader.core to ensure HgCheckoutLoader will also filter on visit type when getting latest snapshot.

Jenkins job DLDHG/gitlab-builds #87 succeeded .
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merged manually