about dialog: update copyright year #1524

Job	Run time
stylecheck	18s
build-opensuse (all)	13m 23s
build-opensuse (horizon.so)	4m 33s
build-debug	15m 13s
build-arch (all)	14m 17s
build (ubuntu:focal, g++, gcc, all)	16m 9s
build-arch (horizon.so)	4m 7s
build (ubuntu:focal, g++, gcc, horizon.so)	4m 33s
build-pr-review	3m 31s
build (ubuntu:jammy, g++, gcc, all)	12m 54s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 18s
build (ubuntu:lunar, g++, gcc, all)	14m 51s
build (ubuntu:lunar, g++, gcc, horizon.so)	4m 54s
build (debian:bullseye, g++, gcc, all)	12m 45s
build (debian:bullseye, g++, gcc, horizon.so)	4m 27s
build (debian:bookworm, clang, clang, all)	12m 45s
build (debian:bookworm, clang, clang, horizon.so)	4m 30s
build (debian:bookworm, g++, gcc, all)	14m 46s
build (debian:bookworm, g++, gcc, horizon.so)	4m 47s
	2h 47m 1s

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