Enhancement: Update localheinz/php-cs-fixer-config

[localheinz]

This PR

• updates localheinz/php-cs-fixer-config
• runs make cs
• does not remove localheinz/php-cs-fixer-config on PHP 7.3

💁‍♂️ For reference, see localheinz/php-cs-fixer-config@1.17.0...1.19.0.

[codecov]

Codecov Report

Merging #113 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master   #113   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity       41     41           
=======================================
  Files             4      4           
  Lines           161    161           
=======================================
  Hits            161    161

Impacted Files	Coverage Δ	Complexity Δ
src/Exception/InvalidExcludeClassName.php	100% <ø> (ø)	2 <0> (ø)	⬇️
src/Exception/NonExistentExcludeClass.php	100% <ø> (ø)	1 <0> (ø)	⬇️
src/Exception/NonExistentDirectory.php	100% <ø> (ø)	1 <0> (ø)	⬇️
src/Helper.php	100% <ø> (ø)	37 <0> (ø)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 845231d...bb1345b. Read the comment docs.