fix(deps): update minor and patch for gatsby-source-contentful

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
contentful (source)	^7.14.12 -> ^7.15.2
fs-extra	^9.0.1 -> ^9.1.0
qs	^6.9.4 -> ^6.9.6

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Release Notes

contentful/contentful.js

v7.15.2

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v7.15.1

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Bug Fixes

• ensure we always fetch the minimum required set of sys attributes (ba9b70a)

v7.15.0

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Features

• remove lodash (fb53819)

v7.14.14

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v7.14.13

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jprichardson/node-fs-extra

v9.1.0

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• Add promise support for fs.rm() (#​841, #​860)
• Upgrade universalify for performance improvments (#​825)

ljharb/qs

v6.9.6

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• [Fix] restore dist dir; mistakenly removed in d4f6c32

v6.9.5

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• [Fix] stringify: do not encode parens for RFC1738
• [Fix] stringify: fix arrayFormat comma with empty array/objects (#​350)
• [Refactor] format: remove util.assign call
• [meta] add "Allow Edits" workflow; update rebase workflow
• [actions] switch Automatic Rebase workflow to pull_request_target event
• [Tests] stringify: add tests for #​378
• [Tests] migrate tests to Github Actions
• [Tests] run nyc on all tests; use tape runner
• [Dev Deps] update eslint, @ljharb/eslint-config, browserify, mkdirp, object-inspect, tape; add aud

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