Update composer Docker tag to v2.7.7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
composer	final	patch	2.7.6 -> 2.7.7

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e68cdb1) to head (7d7115d).

❗ Current head 7d7115d differs from pull request most recent head 39e3afa

Please upload reports for the commit 39e3afa to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##                main      #173   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         3         3           
===========================================
  Files              3         3           
  Lines             17        17           
===========================================
  Hits              17        17           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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