Bumped Icu dependency to RC
merged branch bschussek/intl-fix (PR #8057)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #8057).

Discussion
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[Intl] Bumped Icu dependency to RC

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8035
| License       | MIT
| Doc PR        | -

Commits
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2ce5aa4 [Intl] Bumped Icu dependency to RC