Update Apache Tika 1.26

Release 1.26 - 03/24/2021

• Fix thread safety bug in OpenOffice parser (TIKA-3334).

• The "writeLimit" header now pertains to the combined characters
  written per container document (and embedded documents) in the /rmeta
  endpoint in tika-server (TIKA-3325); it no longer functions only
  per container or embedded document.

• Extract more embedded files in PDFs by recursively processing the
  embedded file tree (TIKA-3332).

• Allow for case insensitive headers for configuration of the PDFParser
  and the TesseractOCRParser in tika-server via Subhajit Das (TIKA-3320).

• Improve detection and parsing of XPS files (TIKA-3316).

• General dependency upgrades (TIKA-3244).

• Great optimization in ForkParser (TIKA-3237).

• Fix parsing of emails attached to other emails in PST files (TIKA-3004).

• MP3 parser should output the xmpDM:duration metadata as seconds not
  milliseconds, consistent with the other Audio and Video parsers (TIKA-3318).

• MP4 parser check if any of the Compatible Brands match when identifying
  the subtype (TIKA-3310).