Disable CodeQL scanning on gh-pages branch

[sequba]

Context

CodeQL action was failing on gh-pages branch due to No source code was seen during the build

Failing action: https://github.com/handsontable/hyperformula/actions/runs/16875426081

[github-actions]

Performance comparison of head (54aea52) vs base (44482c3)

                                     testName |   base |   head |  change
-------------------------------------------------------------------------
                                      Sheet A | 516.82 | 519.82 |  +0.58%
                                      Sheet B | 164.17 | 167.22 |  +1.86%
                                      Sheet T | 144.42 | 142.07 |  -1.63%
                                Column ranges | 510.32 | 507.67 |  -0.52%
Sheet A:  change value, add/remove row/column |  13.81 |  13.01 |  -5.79%
 Sheet B: change value, add/remove row/column | 139.51 | 122.86 | -11.93%
                   Column ranges - add column |  158.1 |  152.3 |  -3.67%
                Column ranges - without batch | 457.59 | 447.19 |  -2.27%
                        Column ranges - batch | 121.24 | 109.96 |  -9.30%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (develop@44482c3). Learn more about missing BASE report.
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #1531   +/-   ##
==========================================
  Coverage           ?   97.22%           
==========================================
  Files              ?      169           
  Lines              ?    14523           
  Branches           ?     3169           
==========================================
  Hits               ?    14120           
  Misses             ?      396           
  Partials           ?        7           

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