- version update to 8.3.21
    Core:
        Fixed bug GH-18304 (Changing the properties of a DateInterval through dynamic properties triggers a SegFault).
        Fix some leaks in php_scandir.
    Filter:
        Fixed bug GH-18309 (ipv6 filter integer overflow).
    GD:
        Fixed imagecrop() overflow with rect argument with x/width y/heigh usage in gdImageCrop().
        Fixed GH-18243 imagettftext() overflow/underflow on font size value.
    Intl:
        Fix reference support for intltz_get_offset().
    LDAP:
        Fixed bug GH-17776 (LDAP_OPT_X_TLS_* options can't be overridden).
        Fix NULL deref on high modification key.
    libxml:
        Fixed custom external entity loader returning an invalid resource leading to a confusing TypeError message.
    OpenSSL:
        Fix memory leak in openssl_sign() when passing invalid algorithm.
        Fix potential leaks when writing to BIO fails.
    PDO Firebird:
        Fixed GH-18276 - persistent connection - "zend_mm_heap corrupted" with setAttribute() (SakiTakamachi).
    SPL:
        Fixed bug GH-18322 (SplObjectStorage debug handler mismanages memory).
    Standard:
        Fixed bug GH-18145 (php8ts crashes in php_clear_stat_cache()).
        Fixed bug GH-18209 (Use-after-free in extract() with EXTR_REFS).
        Fixed bug GH-18212 (fseek with SEEK_CUR whence value and negative offset leads to negative stream position).
        Fix resource leak in iptcembed() on error.
    Zip:
        Fix uouv when handling empty options in ZipArchive::addGlob().

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