fix(deps): update dependency gatsby-plugin-pinterest to v3.2.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
gatsby-plugin-pinterest	dependencies	minor	3.0.0 -> 3.2.1

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Release Notes

robinmetral/gatsby-plugin-pinterest

v3.2.1

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Bug Fixes

• add default values to validation (#​20) (38f9ab1)

v3.2.0

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Features

• update pluginOptionsSchema with deprecation warnings (#​18) (9c328fc)

v3.1.1

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Bug Fixes

• disable CI runs on node@latest (#​19) (5651f93)

v3.1.0

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Bug Fixes

• ci: disable npm cache in travis (#​17) (3253bb1)

Features

• add support for the new pluginOptionsSchema function in gatsby-node (#​15) (691be05)

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