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chore: updated license marks in source files #75

Job	Run time
Lint	32s
Unit tests (ubuntu-latest, oldstable)	35s
Unit tests (windows-latest, stable)	1m 19s
Unit tests (ubuntu-latest, stable)	36s
Unit tests (macos-latest, stable)	50s
Unit tests (macos-latest, oldstable)	39s
Unit tests (windows-latest, oldstable)	1m 10s
	5m 41s