fix(deps): update dependency polished to ^4.3.1 for gatsby-theme-specimens

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
polished (source)	^4.2.2 -> ^4.3.1

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Release Notes

styled-components/polished (polished)

v4.3.1

Compare Source

Bug Fixes & Improvements

• Remove annotate-pure-calls plugin to address incompatibility with later versions of rollup.
• Update dependencies.

v4.3.0

Compare Source

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