add: `linux-headers-lts-6.6-deb` #8954

Job	Run time
test-on-debian (debian:stable, master)	35s
test-on-ubuntu (ubuntu:latest, master)	1m 34s
test-on-debian (debian:stable, develop)	1m 32s
test-on-ubuntu (ubuntu:latest, develop)	1m 22s
test-on-debian (debian:testing, master)	1m 26s
test-on-ubuntu (ubuntu:devel, master)	1m 14s
test-on-debian (debian:testing, develop)	1m 34s
test-on-ubuntu (ubuntu:devel, develop)	1m 27s
test-on-ubuntu (ubuntu:rolling, master)	1m 28s
test-on-debian (debian:unstable, master)	1m 28s
test-on-ubuntu (ubuntu:rolling, develop)	1m 17s
test-on-debian (debian:unstable, develop)	42s
	15m 39s

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