Update node-red-dashboard requirement from ^3.1.6 to ^3.4.0

[dependabot]

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

Release notes

Sourced from node-red-dashboard's releases.

3.4.0: Milestone Release

• Add ability to specify to start page by tab name in url
• Let dialog popup ok and cancel labels be settable by msg.
• Fix CSS variable names. PR #778, #795
• Fix Ja translations. PR #764
• Fix gulp build errors. PR #797

Changelog

Sourced from node-red-dashboard's changelog.

3.4.0: Milestone Release

• Add ability to specify to start page by tab name in url
• Let dialog popup ok and cancel labels be settable by msg.
• Fix CSS variable names. PR #778, #795
• Fix Ja translations. PR #764
• Fix gulp build errors. PR #797

3.3.1: Maintenance Release

• Revert to uglify (for now) to fix color-picker failure. Issue #791

3.3.0: Milestone Release

• Expose manifest.json display property in settingsjs ui section so can be set fullscreen if desired.
• Change gulp build tool to use gulp-terser for later nodejs version support
• Fix datepicker to use change not blur to stop Safari sending double messages
• Update justgage library to include and expose differential mode (either side of a centre point).
• Fix initial drawing of gauge not registering value correctly. Issue #788

3.2.4: Maintenance Release

• Let Link Tabs also be hideable. Issue #785

3.2.3: Maintenance Release

• Re-do package to omit node-sass (not required for prod)

3.2.2: Maintenance Release

• Fix topic return when topic is falsey. Issue #784
• Fix notification toast class. Issue #776
• Fix z-index of dropdown items. Issue #775

3.2.0: Milestone Release

• Fix Cross site scripting for ui_text format input. Issue #772
• Don't accept obviously bad chart data. Issue #713
• Bump libraries to latest

3.1.8: Maintenance Release

• Use Node-RED CSS vars for ui-bas to help themeing. PR #763
• Let spacer also have custom class

3.1.7: Maintenance Release

Fixes

• Fix text-input datetime mode to accept setting time input. Issue #757

... (truncated)

Commits

• 3cf85c9 bump for release 3.4.0
• bbffe96 Bump packed versions
• f78fc86 Update CHANGELOG.md
• 0d81de4 fix gulp error on building dashboard (#797)
• 454a163 Use Node-RED CSS vars in nodes config tab (#795)
• 0478329 Revert "add pathname to show-dashboard button link (#786)" (#798)
• 4741673 add pathname to show-dashboard button link (#786)
• 6f8499e Update Japanese message of ui_control (#764)
• c814a2f Use correct CSS variable for header background (#778)
• fc84b43 Merge branch 'master' of https://github.com/node-red/node-red-dashboard
• Additional commits viewable in compare view

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