utils/beep: assign PKG_CPE_ID

utils/beep: assign PKG_CPE_ID

cpe:/a:beep_project:beep is the correct CPE ID for beep:
https://nvd.nist.gov/products/cpe/search/results?keyword=cpe:2.3:a:beep_project:beep

Indeed, spkr-beep is a fork of https://github.com/johnath/beep as
clearly stated in README.md: "This version of beep has been forked from
Johnathan Nightingales' original beep when johnath/beep#11 required
fixes in 2018, while Johnathan Nightingales' github.com/johnath/beep/
and johnath.com/beep/ was only maintained from around 2000 until around
2013.

So, it is still appropriate to use beep_project:beep CPE ID since the
code base remains the same and no new CPE has been assigned to the fork
(as there have been no new CVEs since 2018).

Signed-off-by: Fabrice Fontaine <redacted>