add: `linux-headers-lts-6.6-deb` #8981

Job	Run time
test-on-debian (debian:stable, master)	1m 19s
test-on-debian (debian:stable, develop)	37s
test-on-ubuntu (ubuntu:latest, master)	1m 18s
test-on-ubuntu (ubuntu:latest, develop)	1m 23s
test-on-debian (debian:testing, master)	37s
test-on-ubuntu (ubuntu:devel, master)	1m 17s
test-on-debian (debian:testing, develop)	38s
test-on-ubuntu (ubuntu:devel, develop)	1m 19s
test-on-debian (debian:unstable, master)	1m 37s
test-on-ubuntu (ubuntu:rolling, master)	1m 15s
test-on-debian (debian:unstable, develop)	1m 23s
test-on-ubuntu (ubuntu:rolling, develop)	1m 21s
	14m 4s

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