Prepare for PHP 8.1

[vearutop]

No description provided.

[github-actions]

Lines Of Code

Language	Files	Lines	Code	Comments	Blanks	Complexity	Bytes
Makefile	1	38 (+6)	27 (+4)	0	11 (+2)	7	2.2K (+170B)
Markdown	2	359 (+6)	254 (+4)	0	105 (+2)	0	10.8K (+159B)
PHP	34 (+1)	3516 (+246)	2761 (+237)	271 (+1)	484 (+8)	199	89K (+5.9K)
Patch	1 (+1)	167 (+167)	149 (+149)	0	18 (+18)	0	5.5K (+5.5K)
YAML	5 (+2)	175 (+74)	160 (+70)	1	14 (+4)	0	4.3K (+1.5K)

[codecov]

Codecov Report

Merging #42 (6d7a21e) into master (f373420) will not change coverage.
The diff coverage is n/a.

❗ Current head 6d7a21e differs from pull request most recent head 9101f68. Consider uploading reports for the commit 9101f68 to get more accurate results

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   96.79%   96.79%           
=======================================
  Files          10       10           
  Lines         530      530           
=======================================
  Hits          513      513           
  Misses         17       17           

Impacted Files	Coverage Δ
src/JsonPatch.php	100.00% <ø> (ø)

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