Safari 15.6

[ahmetgeymen]

• Add Safari 15.6 for mobile and desktop browsers
• Extend unit test

[ahmetgeymen]

Also added Safari 15.5 on macOS check for issue #2652

[codecov]

Codecov Report

Merging #2695 (7e0afab) into 6.1.x (300d2e1) will not change coverage.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##              6.1.x    #2695   +/-   ##
=========================================
  Coverage     50.84%   50.84%           
  Complexity      856      856           
=========================================
  Files          1818     1818           
  Lines         67339    67339           
  Branches      30699    30699           
=========================================
  Hits          34236    34236           
  Misses        33103    33103           

Flag	Coverage Δ
full	45.84% <66.66%> (ø)
lite	2.11% <0.00%> (ø)
phpunit	75.98% <ø> (ø)
standard	26.52% <33.33%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...er-agents/browsers/safari/safari-15-0-to-15-6.json	85.71% <ø> (ø)
...nts/browsers/mobile-safari/mobile-safari-15-x.json	59.25% <66.66%> (ø)

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