Update dependency express-validator to ^6.3.1

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
express-validator (source)	dependencies	patch	^6.3.1	homepage, source

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Release Notes

express-validator/express-validator

v6.3.1

Compare Source

• #​813 - don't use Symbol internally to avoid breaking express-validator reuse

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