Update dependency metsrw to v0.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
metsrw	==0.3.21 -> ==0.6.1

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Release Notes

artefactual-labs/mets-reader-writer (metsrw)

v0.6.1

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• Fix parsing error of non-existent amdSec.
  This fixes a METS parsing error caused by Archivematica's failure to read the transfer bag metadata, which resulted in a non-existent amdSec element being associated with the objects directory in the structMap.
• Add support for Python 3.13.

v0.6.0

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• Drop Python 3.8 support.

v0.5.1

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• Fix fileSec group sorting with non default groups
• Add Read the Docs configuration file
• Upgrade dependencies

v0.5.0

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• Drop Python 3.6 and 3.7 support.
• Migrate package setup to pyproject.toml

v0.4.0

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• Drop Python 2.7 support
• Use local XML schemas in validation tests
• Parse and serialize custom logical structMaps
• Support METS of DSpace transfer

v0.3.23

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Ignore XML comments on PREMIS elements parsing

v0.3.22

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