Update actions/checkout action to v7 (#6)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Update appimage-nightly.yml

Update make-appimage.sh

bump `LATEST_VERSION` [skip ci]

bump `LATEST_VERSION` [skip ci]

Update actions/upload-artifact action to v7.0.1 (#5)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Update make-appimage.sh