bot: Update Meshtastic to 2.7.6 (29319394) (29319394)

checkupdates botrequested to merge
fdroid/checkupdates-bot-fdroiddata:com.geeksville.mesh into master

~com.geeksville.mesh checkupdates-bot run https://gitlab.com/fdroid/checkupdates-runner/-/jobs/12102135859

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