ci: increase test integration step timeout

[Fraccaman]

Describe your changes

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.90%. Comparing base (aa1667c) to head (71fb057).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3988   +/-   ##
=======================================
  Coverage   73.89%   73.90%           
=======================================
  Files         341      341           
  Lines      106463   106463           
=======================================
+ Hits        78668    78678   +10     
+ Misses      27795    27785   -10     

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