fix: alternate formula eval implementation (backport #902)

[mergify]

This is an automatic backport of pull request #902 done by Mergify.
Cherry-pick of 7fb3508 has failed:

On branch mergify/bp/version-14-hotfix/pr-902
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	both modified:   hrms/payroll/doctype/salary_slip/salary_slip.py
	both modified:   hrms/payroll/doctype/salary_slip/test_salary_slip.py

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[codecov-commenter]

Codecov Report

Merging #905 (06f319e) into version-14-hotfix (6a252ad) will increase coverage by 0.05%.
The diff coverage is 96.00%.

@@                  Coverage Diff                  @@
##           version-14-hotfix     #905      +/-   ##
=====================================================
+ Coverage              73.53%   73.58%   +0.05%     
=====================================================
  Files                    193      193              
  Lines                   9972     9996      +24     
=====================================================
+ Hits                    7333     7356      +23     
- Misses                  2639     2640       +1     

Files Changed	Coverage
hrms/payroll/doctype/salary_slip/salary_slip.py	96.00%

[frappe-pr-bot]

🎉 This PR is included in version 14.11.1 🎉

The release is available on GitHub release

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