Update dependency PyNaCl to v1.5.0 - abandoned

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PyNaCl	==1.4.0 -> ==1.5.0

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Release Notes

pyca/pynacl

v1.5.0

Compare Source

• BACKWARDS INCOMPATIBLE: Removed support for Python 2.7 and Python 3.5.
• BACKWARDS INCOMPATIBLE: We no longer distribute manylinux1
  wheels.
• Added manylinux2014, manylinux_2_24, musllinux, and macOS
  universal2 wheels (the latter supports macOS arm64).
• Update libsodium to 1.0.18-stable (July 25, 2021 release).
• Add inline type hints.

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