Update kas example format to not use `refspec`

bootlin / training-materials

Bootlin embedded Linux and kernel training materials

https://bootlin.com/training/

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Open lucaceresoli opened 4 months ago

lucaceresoli commented 4 months ago

refspec for repositories is deprecated as of format version 14, added about 1 year ago: https://kas.readthedocs.io/en/latest/format-changelog.html#version-14

Update the kas example to use commit and branch.