chore(deps): update dependency josepy to v1.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
josepy	1.13.0 → 1.15.0

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Release Notes

certbot/josepy (josepy)

v1.15.0

Compare Source

• Added a deprecation warning about future backwards incompatible changes. The
  text of that warning is "The next major version of josepy will remove
  josepy.util.ComparableX509 and all uses of it as part of removing our
  dependency on PyOpenSSL. This includes modifying any functions with
  ComparableX509 parameters or return values. This will be a breaking change.
  To avoid breakage, we recommend pinning josepy < 2.0.0 until josepy 2.0.0 is
  out and you've had time to update your code."
• Added support for Python 3.13.
• Dropped support for Python 3.7.
• Support for Python 3.8 has been deprecated and will be removed in the next
  scheduled release.

v1.14.0

Compare Source

• Added support for Python 3.11 and 3.12.
• Support for Python 3.7 has been deprecated and will be removed in the next
  scheduled release.
• Dropped support for Python 3.6.
• Added a new valid PGP key for signing our PyPI packages with the fingerprint
  F2871B4

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