Add 6.8 kernel to CI build. Update patch versions of existing kernels… #2075

Job	Run time
env-protect-setup	5s
authorize	1s
get-dev-image / get-image	7s
generate-matrix	3m 32s
clang-tidy	9m 56s
code-coverage	31m 3s
build-and-test (BPF opt (4.14.254), kvm, --config=qemu-bpf --compilation_mode=opt --//bazel/test_...	3m 16s
build-and-test (BPF opt (6.1.18), kvm, --config=qemu-bpf --compilation_mode=opt --//bazel/test_ru...	3m 2s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	5m 32s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	3m 50s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	4m 24s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	4m 13s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	4m 5s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	3m 14s
build-and-test-status	1s
	1h 16m 21s

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