[ci] Update to actions/checkout@v3 to silence GitHub warnings

Signed-off-by: Michael Brown <mcb30@ipxe.org>
2 files changed
tree: 6e988aa7ce77be5bd2396bfca77c672bf0c195f3
  1. .github/
  2. contrib/
  3. src/
  4. COPYING
  5. COPYING.GPLv2
  6. COPYING.UBDL
  7. README