fix(deps): update dependency lodash to ^4.17.20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
lodash (source)	dependencies	patch	^4.17.15 -> ^4.17.20
lodash (source)	dependencies	patch	^4.17.11 -> ^4.17.20
lodash (source)	dependencies	patch	^4.17.10 -> ^4.17.20

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Release Notes

lodash/lodash

v4.17.20

Compare Source

v4.17.19

v4.17.16

Compare Source

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This PR has been generated by WhiteSource Renovate. View repository job log here.

[matticbot]

Test live: https://calypso.live/?branch=renovate/lodash-monorepo

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[wp-desktop]

WordPress Desktop CI Failure for job "wp-desktop-source".

@ please inspect this job's build steps for breaking changes at this link. For temporal failures, you may try to "Rerun Workflow from Failed".

Please also ensure this branch is rebased off latest Calypso.

[scinos]

Can't be merged until there is a matching version of lodash-es.

[nsakaimbo]

Build error:

$ node ${NODE_ARGS:---max_old_space_size=8192} ./node_modules/webpack/bin/webpack.js --config client/webpack.config.js --display errors-only && yarn run build-languages-if-enabled
(node:7902) UnhandledPromiseRejectionWarning: Error: [ExtensiveLodashReplacementPlugin] Root `lodash` and `lodash-es` versions do not match.
    at createError (/home/circleci/wp-calypso/packages/webpack-extensive-lodash-replacement-plugin/index.js:7:9)
    at ExtensiveLodashReplacementPlugin.initBaseLodashData (/home/circleci/wp-calypso/packages/webpack-extensive-lodash-replacement-plugin/index.js:71:10)
(node:7902) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:7902) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
ModuleNotFoundError: Module not found: Error: [ExtensiveLodashReplacementPlugin] Root `lodash` and `lodash-es` versions do not match.