[PR] Fix case-insensitive ZIP entry matching in ZipFileZipEntr ySource under Turkish Locale [poi]

kali834x opened a new pull request, #1136:
URL: https://github.com/apache/poi/pull/1136

   `ZipFileZipEntrySource.getEntry()` performs case-insensitive matching of ZIP entry names. However, its implementation is inconsistent with `ZipInputStreamZipEntrySource`, which normalizes names using `toLowerCase(Locale.ROOT)` before lookup.
   
   Since OPC ZIP entry names are standardized and should be compared using locale-independent ASCII semantics, both implementations should use the same normalization strategy to ensure consistent behavior across entry source types.
   
   This PR aligns `ZipFileZipEntrySource` with `ZipInputStreamZipEntrySource` by normalizing names using `toLowerCase(Locale.ROOT)`. A unit test is added to verify consistent case-insensitive lookups and to guard against locale-related regressions, including under the Turkish locale.
   


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