deps: bump HLab.Core to drop the dead CryptService

[mgth]

Picks up mgth/HLab.Core#6, which removes CryptService — TripleDES with a hardcoded key and IV, referenced from nowhere in either repository. The smart-TV token encryption in #542 deliberately did not build on it.

One line, one submodule pointer:

Submodule HLab.Core 7b6aeec..7c6ed67:
  > CryptService: drop the unused TripleDES helper

Why 7c6ed67 and not the master tip

7c6ed67 is the old pin plus that deletion and nothing else, and it is permanently reachable through the #6 merge commit, so it does not depend on the PR branch surviving.

HLab.Core master has since moved six commits further:

8b5f9c8	Restore HLab.Mvvm.Application and finish net10 alignment
70cd582	Bootstrapper: surface stalled bootloaders on stderr
6f17c90	ApplicationBootloader: default MainViewMode to DefaultViewMode
0494779	MessageBus: root subscribed delegates
1a5d56a	MvvmService: enregistrer les generiques fermes au runtime
e5b2388	DocumentService: logger les echecs d ouverture de document

That is a restored HLab.Mvvm.Application project plus MessageBus and MvvmService behaviour changes — 447 insertions across 36 files. Adopting it is a separate decision with its own testing, not something to carry in behind a one-file deletion. Tracking the tip here would have done exactly that.

Verification

dotnet build LittleBigMouse-Linux.slnf succeeds with HLab.Core/CryptService.cs actually absent from the working tree.

Independent of #542 — disjoint files, both branch off master, they merge in either order.

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