[BUGFIX] Don't break on numeric $_SERVER keys

Prevent PHP TypeError when creating request from globals containing
numeric keys.

Resolves: #89980
Releases: master
Change-Id: I4c22891a0a341b11cb6c9a42923dadeb45a07524
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62736


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Felix P. <f.pachowsky@neusta.de>
Tested-by: Alexander Schnitzler <review.typo3.org@alexanderschnitzler.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Felix P. <f.pachowsky@neusta.de>
Reviewed-by: Alexander Schnitzler <review.typo3.org@alexanderschnitzler.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>