Update stable tag to 6.8.1

[ockham]

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[github-actions]

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Props bernhard-reiter.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.92%. Comparing base (2e3778c) to head (4509682).
⚠️ Report is 1 commits behind head on trunk.

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk     #386      +/-   ##
============================================
- Coverage     53.91%   52.92%   -1.00%     
  Complexity     4419     4419              
============================================
  Files           298      298              
  Lines         39448    39448              
============================================
- Hits          21269    20877     -392     
- Misses        18179    18571     +392     

Flag	Coverage Δ
e2e-js	45.71% <ø> (-0.02%)	⬇️
e2e-php	40.84% <ø> (-1.75%)	⬇️
javascript	15.07% <ø> (ø)
phpunit	29.96% <ø> (ø)

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