Fix license header in core files #6079

Job	Run time
lint	31s
get-matrices	5s
get-containers	0s
Running Module Tests	0s
test-python-container	0s
test-pubsub-python (3.8, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-l...	1m 9s
test-python (3.8, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gn...	1m 10s
test-pubsub-python (3.8, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-li...	1m 10s
test-python (3.8, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gnu...	1m 10s
test-pubsub-python (3.13, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-...	1m 10s
test-python (3.13, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-g...	1m 8s
test-pubsub-python (3.13, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-l...	1m 9s
test-python (3.13, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gn...	1m 9s
	9m 51s

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