Incorrect year in license header

[germain-gg]

Describe the bug

All output files use the year 2021

To Reproduce

run yarn build and look at the output

Expected behavior

For each file to use the correct year on their license header based on when that file was last mofieid

Additional context

This is defined in stub-generator/kotlin.py, stub-generator/swift.py and I haven't found where the TS bit gets generated

[pixlwave]

There is also base_types/swift that may need to be considered.