Bump periph.io/x/periph from 3.6.8+incompatible to 3.7.2

[xavpaice]

• Release notes

updated-dependencies:

• dependency-name: periph.io/x/periph
  dependency-type: direct:production
  update-type: version-update:semver-minor

Module periph.io/x/periph has moved from 3.6.8 to re-arrange locations
in 3.7.2. This reworks to take advantage of the new format.

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