Update node-red-dashboard requirement from ^3.1.3 to ^3.1.6

[dependabot[bot]]

Updates the requirements on node-red-dashboard to permit the latest version.

Release notes

Sourced from node-red-dashboard's releases.

3.1.6: Maintenance Release

Fixes

• Add PR to deduplicate layout list entries. PR #752
• Really fix date picker to always send selected date. Issue #753
• Add PR to fix validity checks of node config. PR #755
• Add datetime option to text input

Changelog

Sourced from node-red-dashboard's changelog.

3.1.6: Maintenance Release

Fixes

• Add PR to deduplicate layput list entries. PR #752
• Really fix date picker to always send selected date. Issue #753
• Add PR to fix validity checks of node config. PR #755
• Add datetime option to text input

3.1.5: Maintenance Release

Fixes

• Fix dropdown multiselect to search on labels and handle upper/lower case. Issue #749
• Fix dropdown to not exit on mixed string and numerics. Issue #748

3.1.4: Maintenance Release

Fixes

• Fix colorpicker swatch overlapping colorpicker dial. Issue #746
• Let dropdown multiselect "select all" only select those in search. Issue #747

3.1.3: Maintenance Release

Fixes

• Remove main entry from package.json. Issue #740
• Let date-picker send repeated existing values.
• Warn if Node.js version not 12+.
• Allow ui-dropdown to accept single string for one valid option.
• Fix socketid back to be in sync with reality. Issue #738

3.1.2: Maintenance Release

Fixes

• Fix dialogue notification to be able to return 1. Issue #736
• Force saving of spacer size. Forum Issue

3.1.1: Maintenance Release

Fixes

• Replace ui_control messages feedback block (found out why it was there...)

3.1.0: Maintenance Release

Fixes

... (truncated)

Commits

• 7601e69 bump to latest - add datetime input type option
• 30c7ccf fix duplicate tabs in layout list after refresh (#752)
• e897a5d perform node validation adter addition (#755)
• d359fc0 fix to datepicker to always send date
• bf3dd34 Bump fr 3.1.5 release
• dc7de9a Fix dropdown handling of mixed string and number types
• a085ea7 Fix multiselect search order and case sensitivity
• 4467c56 Fix multiselect dropdown to honour search when selecting all
• e22f6e9 Merge branch 'master' of https://github.com/node-red/node-red-dashboard
• 86d2f0e stop colour picker swatch overlaying actual picker
• Additional commits viewable in compare view

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