Update meshtastic requirement from ~=2.3.4 to ~=2.3.8

[dependabot[bot]]

Updates the requirements on meshtastic to permit the latest version.

Release notes

Sourced from meshtastic's releases.

Meshtastic Python 2.3.8

This release should see some dramatic performance improvements due to the first change in the list below; updates are highly advised!

What's Changed

• (high-pri fix) Update python client to use the 'modern' meshtastic protocol init flow by @​geeksville in meshtastic/python#560
• Pretty indent --info JSON output (see below for details) by @​geeksville in meshtastic/python#558
• Use the new Heartbeat payload variant for the heartbeat instead of an empty ToRadio packet by @​ianmcorvidae in meshtastic/python#561

Full Changelog: https://github.com/meshtastic/python/compare/2.3.7...2.3.8

As with prior releases: if the prebuilt binaries don't exist for your platform or don't work, please use pip to install instead.

Commits

• 022a8a1 protobufs: v2.3.8
• 21f6e25 Merge pull request #561 from ianmcorvidae/use-heartbeat
• 243e297 Use the new Heartbeat payload variant for the heartbeat instead of an empty T...
• 9fc86f9 Merge pull request #558 from geeksville/pr-fixjson
• e5999f5 Merge pull request #560 from geeksville/pr-fixchannel
• 3886bc1 Update python client to use the 'modern' meshtastic protocol init flow
• 7fe98bc Pretty indent --info JSON output (see below for details)
• 2f9307f bump version
• 3d6fa36 Merge pull request #556 from ianmcorvidae/enter-dfu
• 6812f50 Add --enter-dfu for entering DFU mode on NRF52 devices via admin message
• Additional commits viewable in compare view

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