Update copyright statement

[cessda-bitbucket-importer]

Original report on BitBucket by John Shepherdson (GitHub: john-shepherdson).

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Update for all components.

Update associated tests.

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Copyright (C) 2017 - 2021 CESSDA ERIC

-> Copyright (C) 2017 - 2023 CESSDA ERIC

[cessda-bitbucket-importer]

Original comment by Matthew Morris (GitHub: matthew-morris-cessda).

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link to pull request removed

[cessda-bitbucket-importer]

Original comment by John Shepherdson (GitHub: john-shepherdson).

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