Updating Dotenv bridge code with PHP 8.1 features

[msmakouz]

Q	A
Bugfix?	❌
Breaks BC?	❌
New feature?	❌
Issues	#512

[codecov]

Codecov Report

Merging #611 (453bcbf) into 3.0 (06a5b93) will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##                3.0     #611   +/-   ##
=========================================
  Coverage     83.48%   83.48%           
  Complexity     5873     5873           
=========================================
  Files           667      667           
  Lines         14893    14893           
=========================================
  Hits          12433    12433           
  Misses         2460     2460           

Impacted Files	Coverage Δ
.../Bridge/Dotenv/src/Bootloader/DotenvBootloader.php	0.00% <0.00%> (ø)

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