build(deps): update fiftyone requirement from <=0.21.4 to <=0.21.6 in /requirements

[dependabot[bot]]

Updates the requirements on fiftyone to permit the latest version.

Release notes

Sourced from fiftyone's releases.

v0.21.6

Please visit our fiftyone release notes

Commits

• d3977aa Merge pull request #3403 from voxel51/release/v0.21.6
• a6fafde Merge pull request #3405 from voxel51/bugfix/teams-1509
• 2b561cc updating release notes
• cd4a86d fixing bug when selecting nested fields within already-selected root fields
• 7cff9bc Merge pull request #3402 from voxel51/release-note
• d5dcf22 bump runner size
• cc4eabe merge
• 6012904 note
• 0743811 print_report(): add note/link to sklearn.metrics for doc on micro/macro/weigh...
• 02d425c Merge pull request #3401 from voxel51/bug/color-map
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #1668 (c5be575) into master (1e414c3) will decrease coverage by 0%. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1668 +/- ## ====================================== - Coverage 85% 85% -0% ====================================== Files 291 291 Lines 12858 12858 ====================================== - Hits 10987 10986 -1 - Misses 1871 1872 +1 ```

[Borda]

@dependabot rebase