chore: update formatjs monorepo to v8.15.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@formatjs/intl-numberformat	8.15.4 → 8.15.6

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Release Notes

formatjs/formatjs (@​formatjs/intl-numberformat)

v8.15.6

Compare Source

v8.15.5

Compare Source

Note: Version bump only for package @​formatjs/intl-numberformat

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Pull Request Test Coverage Report for Build 19106950084

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.966%

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Totals
Change from base Build 19106898237:	0.0%
Covered Lines:	34259
Relevant Lines:	34788

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💛 - Coveralls

[github-actions]

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🔍 First Generation Visual Regression Test Results

When a visual regression test fails (or has previously failed while working on this branch), its results can be found in the following URLs:

• Spectrum | Light | Medium | LTR
• Spectrum | Dark | Large | RTL
• Express | Light | Medium | LTR
• Express | Dark | Large | RTL
• Spectrum-two | Light | Medium | LTR
• Spectrum-two | Dark | Large | RTL
• High Contrast Mode | Medium | LTR

Deployed to Azure Blob Storage: pr-5848

If the changes are expected, update the current_golden_images_cache hash in the circleci config to accept the new images. Instructions are included in that file.
If the changes are unexpected, you can investigate the cause of the differences and update the code accordingly.