sonar: MAJOR — S6479 Do not use Array index in keys

[github-actions]

SonarCloud Finding — S6479

Do not use Array index in keys

sonarcloud-keys: AZ-V53sndRHfOsokVAkG,AZ-V53qadRHfOsokVAjc,AZ-V53qadRHfOsokVAje

File	Line
sites/promo/src/components/comparison.tsx	310
sites/promo/src/components/sponsors.tsx	245
sites/promo/src/components/sponsors.tsx	262

Fix

Follow SonarCloud rule guidance for S6479.

[github-actions]

All constituent SonarCloud findings have been resolved.