docs(containers): add it-mil as supported region

[scaleway-bot]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 3.91174% with 958 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.76%. Comparing base (2f1bdb2) to head (7a3a8ba).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/namespaces/mongodb/v1/mongodb_cli.go	0.00%	958 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6029      +/-   ##
==========================================
- Coverage   51.34%   50.76%   -0.58%     
==========================================
  Files         358      359       +1     
  Lines       81156    82147     +991     
==========================================
+ Hits        41669    41702      +33     
- Misses      39487    40445     +958     

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