fix(delete-modal): Changed the color of the help text with grayScale.dark1 in DeleteModal

[prosdev0107]

SUMMARY

the contrast on the help text doesn't seem to meet accessibility reqs

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #18786 (af9d035) into master (5bb406b) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #18786      +/-   ##
==========================================
- Coverage   66.32%   66.31%   -0.01%     
==========================================
  Files        1620     1620              
  Lines       63060    63086      +26     
  Branches     6368     6372       +4     
==========================================
+ Hits        41823    41837      +14     
- Misses      19579    19592      +13     
+ Partials     1658     1657       -1     

Flag	Coverage Δ
javascript	51.25% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...rset-frontend/src/components/DeleteModal/index.tsx	84.21% <100.00%> (ø)
...nts/controls/DateFilterControl/DateFilterLabel.tsx	40.86% <0.00%> (-10.76%)	⬇️
...perset-frontend/src/views/components/MenuRight.tsx	80.00% <0.00%> (-0.49%)	⬇️
superset-frontend/src/views/App.tsx	0.00% <0.00%> (ø)
superset-frontend/src/components/Button/index.tsx	100.00% <0.00%> (ø)
superset-frontend/src/components/ListView/utils.ts	77.41% <0.00%> (ø)
...rontend/src/components/ListView/Filters/Search.tsx	78.57% <0.00%> (ø)
...s/legacy-plugin-chart-country-map/src/countries.ts	100.00% <0.00%> (ø)
...board/components/nativeFilters/FilterBar/index.tsx	69.82% <0.00%> (ø)
...ontend/src/explore/components/QueryAndSaveBtns.jsx
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5bb406b...af9d035. Read the comment docs.

[rusackas]

/testenv up

[github-actions]

@rusackas Ephemeral environment spinning up at http://35.87.138.9:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[rusackas]

Thanks for this... I just made it one shade lighter which passes accessibility standards, but still has some contrast with the text above it.

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.