Run on PHP 8.1 normally and add nightly PHP as allowed to fail

[williamdes]

• Run on PHP 8.1 normally
• Add nightly PHP as allowed to fail

[codecov-commenter]

Codecov Report

Merging #452 (4fdbf33) into main (172540d) will decrease coverage by 7.42%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #452      +/-   ##
==========================================
- Coverage   72.93%   65.50%   -7.43%     
==========================================
  Files         127      127              
  Lines       23024    22960      -64     
==========================================
- Hits        16792    15041    -1751     
- Misses       6232     7919    +1687     

Flag	Coverage Δ
php-5.3-ubuntu-latest	45.08% <ø> (-27.33%)	:arrow_down:
php-5.4-ubuntu-latest	45.08% <ø> (-27.33%)	:arrow_down:
php-5.5-ubuntu-latest	45.07% <ø> (-27.34%)	:arrow_down:
php-5.6-ubuntu-latest	45.12% <ø> (-0.01%)	:arrow_down:
php-7.1-ubuntu-latest	45.95% <ø> (+0.28%)	:arrow_up:
php-7.2-ubuntu-latest	45.90% <ø> (+0.28%)	:arrow_up:
php-7.3-ubuntu-latest	45.89% <ø> (+0.27%)	:arrow_up:
php-7.4-ubuntu-latest	45.89% <ø> (+0.28%)	:arrow_up:
php-8.0-ubuntu-latest	67.26% <ø> (+1.91%)	:arrow_up:

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

Impacted Files	Coverage Δ
examples/example_027.php	61.53% <0.00%> (-37.96%)	:arrow_down:
tcpdf_barcodes_1d.php	60.29% <0.00%> (-30.15%)	:arrow_down:
examples/example_058.php	75.86% <0.00%> (-24.14%)	:arrow_down:
examples/example_039.php	80.64% <0.00%> (-19.36%)	:arrow_down:
tcpdf_barcodes_2d.php	62.98% <0.00%> (-12.99%)	:arrow_down:
tcpdf.php	62.72% <0.00%> (-8.16%)	:arrow_down:
include/tcpdf_static.php	48.30% <0.00%> (-5.24%)	:arrow_down:
include/tcpdf_colors.php	35.00% <0.00%> (-1.67%)	:arrow_down:
include/tcpdf_fonts.php	43.75% <0.00%> (-1.03%)	:arrow_down:
tcpdf_autoconfig.php	64.81% <0.00%> (-0.93%)	:arrow_down:
... and 14 more

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