[cmake,pybind] Enable INTERPROCEDURAL_OPTIMIZATION to fix LTRANS warnings

Lars Bilkerequested to merge
bilke/ogs:fix-py-lto-warnings into master

Fixes these warnings:

[520/591] Linking CXX shared module Applications/Python/ogs.OGSMesh/ogs/OGSMesh.cpython-313-x86_64-linux-gnu.so
lto-wrapper: warning: using serial compilation of 4 LTRANS jobs
lto-wrapper: note: see the ‘-flto’ option documentation for more information

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