Add self to codeowners #1035

Job	Run time
poetry	24s
generate-lockfile	50s
changelog	31s
ruff-lint	30s
yamllint	23s
markdownlint	23s
ruff-format	26s
check-docs-build	28s
check-in-docker (3.11, 3.0.0)	4m 15s
unittest (3.13, mysql, stable)	11m 10s
unittest (3.11, postgresql, 3.0.0)	7m 31s
unittest (3.11, postgresql, stable)	9m 50s
unittest_report (3.13, postgresql, stable)	12m 43s
	49m 24s

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