[stable33] fix(http): avoid iconv for header ascii fallback#60722
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iconv transliteration is locale- and config-dependent and fails silently on some setups. UnicodeString::ascii() from symfony/string uses a built-in transliteration table backed by symfony/polyfill-intl-normalizer, so it works on all setups without requiring optional PHP extensions. Assisted-by: Claude:claude-sonnet-4-6 Signed-off-by: Christoph Wurst <1374172+ChristophWurst@users.noreply.github.com>
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Backport of PR #60649