maint: bump ansys-mapdl-core from 0.68.5 to 0.68.6 #1929

Job	Run time
Check library vulnerabilities (development mode)	48s
Code style	53s
Check library vulnerabilities (default mode - only on main)	0s
Documentation Style Check	15s
Update CHANGELOG (on release)	0s
Doc building	3m 34s
Build and Smoke tests (ubuntu-latest, 3.10, false)	57s
Build and Smoke tests (ubuntu-latest, 3.11, false)	54s
Build and Smoke tests (ubuntu-latest, 3.12, false)	1m 8s
Build and unit testing (v23.1-ubuntu)	1m 51s
Build and unit testing (v23.2.0)	1m 33s
Build and unit testing (v24.1-ubuntu-student)	1m 43s
Package library	13s
Deploy development documentation	0s
Release project to public PyPI and GitHub	0s
Deploy stable documentation	0s
	13m 49s

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