[Intl] Updated icu.ini up to ICU 53
minor #11913 [Intl] Updated icu.ini up to ICU 53 (webmozart)

This PR was merged into the 2.3 branch.

Discussion
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[Intl] Updated icu.ini up to ICU 53

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Extracted from #9206.

Commits
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260e2fe [Intl] Updated icu.ini up to ICU 53