devDependencies pinned @iyulab/components to ^1.23.0 while
peerDependencies already required >=1.27.0 for the formatCurrency
delegation added in 0.8.2 — the local dev/test environment could sit on
a components version this package's own runtime code no longer
supports. Raised the floor to match and documented it in the changelog.

Also fixed a stale test description (CurrencyHelper delegates to
formatCurrency now; it isn't a re-export).