Update dependency pyrsistent to v0.18.1

This MR contains the following updates:

Package	Update	Change
pyrsistent	minor	==0.16.0 -> ==0.18.1

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Release Notes

tobgu/pyrsistent

v0.18.1

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v0.18.0

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v0.17.3

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v0.17.2

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v0.17.1

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v0.17.0

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v0.16.1

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