add: `linux-headers-lts-6.6-deb` #8993

Job	Run time
test-on-ubuntu (ubuntu:latest, master)	1m 40s
test-on-ubuntu (ubuntu:latest, develop)	1m 20s
test-on-debian (debian:stable, master)	39s
test-on-ubuntu (ubuntu:devel, master)	1m 32s
test-on-debian (debian:stable, develop)	38s
test-on-debian (debian:testing, master)	1m 21s
test-on-ubuntu (ubuntu:devel, develop)	1m 31s
test-on-debian (debian:testing, develop)	1m 30s
test-on-ubuntu (ubuntu:rolling, master)	1m 18s
test-on-debian (debian:unstable, master)	1m 21s
test-on-ubuntu (ubuntu:rolling, develop)	1m 14s
test-on-debian (debian:unstable, develop)	40s
	14m 44s

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