CycloneDX 1.4 requires the top-level BOM version to be an integer.
Emit numeric 1 so SBOMs generated from both APK and opkg package
indexes conform to the schema.
Signed-off-by: Cui Shuang <imcusg@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/25059
Signed-off-by: Robert Marko <robimarko@gmail.com>