Enhancement: Use Php80 rule set

[localheinz]

This pull request

• uses the Php80 rule set
• runs make coding-standards

[codecov]

Codecov Report

Merging #107 (9e54d35) into main (de182bc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #107   +/-   ##
=========================================
  Coverage     99.11%   99.11%           
  Complexity       59       59           
=========================================
  Files            14       14           
  Lines           225      225           
=========================================
  Hits            223      223           
  Misses            2        2           

Impacted Files	Coverage Δ
src/Reporter/DefaultReporter.php	100.00% <ø> (ø)
src/SlowTest.php	100.00% <ø> (ø)
src/Subscriber/TestPassedSubscriber.php	93.75% <ø> (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 de182bc...9e54d35. Read the comment docs.