Bump convict from 6.2.2 to 6.2.3 in /webapp

[dependabot[bot]]

Bumps convict from 6.2.2 to 6.2.3.

Changelog

Sourced from convict's changelog.

[6.2.3] - 2022-05-07

Fixed

• More more complete fix for prototype pollution vulnerability first addressed in #384 (Marc-Aurèle Darche @​madarche, Snyk Security team)

Commits

• deef5d7 v6.2.3
• 5e64b53 More recent Ubuntu dist for Travis CI build
• 1ea0ab1 More more complete fix for prototype pollution
• c7acb02 Update info regarding publishing on NPM
• See full diff in compare view

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