[bootlin/training-materials] 2d56c3: yocto: labs: Use dunfell-23.0.15

[Maxime Chevallier]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 2d56c350e3225e05ab254c67cf48060718063ace
      https://github.com/bootlin/training-materials/commit/2d56c350e3225e05ab254c67cf48060718063ace
  Author: Maxime Chevallier <maxime.chevallier at bootlin.com>
  Date:   2022-04-01 (Fri, 01 Apr 2022)

  Changed paths:
    M labs/yocto-first-build/yocto-first-build.tex

  Log Message:
  -----------
  yocto: labs: Use dunfell-23.0.15

Dunfell 23.0.15 fixes a few python3 issues, allowing to build on Fedora
35.

Signed-off-by: Maxime Chevallier <maxime.chevallier at bootlin.com>