Prepare CI for 1.11 release

[svchb]

Since 1.11 will be released in the coming weeks lets prepare our CI for this case.

For now I propose:

• keep 1.9 as is
• keep 1.10 as is
• additionally run 1.11

After the backport of JuliaLang/julia#55009 remove 1.9 and run all tests on 1.10 and 1.11.
Since 1.10 is a LTS release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.37%. Comparing base (2ccc340) to head (1a9f3f5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #599   +/-   ##
=======================================
  Coverage   69.37%   69.37%           
=======================================
  Files          85       85           
  Lines        5124     5124           
=======================================
  Hits         3555     3555           
  Misses       1569     1569           

Flag	Coverage Δ
unit	69.37% <ø> (ø)

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