Bump grunt-concurrent from 1.0.1 to 2.3.1 in /js

[dependabot[bot]]

Bumps grunt-concurrent from 1.0.1 to 2.3.1.

Commits

• 0d76521 2.3.1
• 4f9de30 trying out something new
• 62e5c9d 2.3.0
• 47f809e meta tweaks
• d239765 2.2.1
• 8affd01 fix dependencies
• db59e35 minor tweaks
• 489c56d 2.2.0
• 00450a3 Close #83 PR: Allow task to be in fact an array of tasks.
• 3f51264 2.1.0
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #434.

[dependabot[bot]]

Superseded by #434.