Treepoem

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* Support Python 3.12.

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* Upgrade vendored BWIPP to its 2022-10-19 release.
This version includes some more validation improvements and small rendering fixes.
You can read its changelog in the `treepoem repo <https://github.com/adamchainz/treepoem/blob/main/src/treepoem/postscriptbarcode/CHANGES>`__.

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* Upgrade vendored BWIPP to its 2022-07-29 release.
This version includes:

* new helper encoders for GS1 Digital Link URIs included in QR Code and Data Matrix symbols
* improved validation of GS1 syntax data
* a friendly escape mechanism for ASCII control characters

You can read its changelog in the `treepoem repo <https://github.com/adamchainz/treepoem/blob/main/src/treepoem/postscriptbarcode/CHANGES>`__.

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* Upgrade vendored BWIPP to its 2022-06-10 release.
This version includes some fixes for the rendering of certain barcode formats.
You can read its changelog in the `treepoem repo <https://github.com/adamchainz/treepoem/blob/main/src/treepoem/postscriptbarcode/CHANGES>`__.

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* Support Python 3.11.

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* Drop Python 3.6 support.