[examples] Mitigate mesh-induced anisotropy in cantilever beam simulations

[alxbilger]

Regarding #5982, I thought it is not very credible for SOFA to showcase examples with mesh-induced anisotropy.

This PR requires to update the regression files.

[with-all-tests]

[ci-depends-on https://github.com/sofa-framework/Regression/pull/102]

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[th-skam]

Just after adding the regression files.

[sofabot]

[ci-depends-on] detected during build #2.

To unlock the merge button, you must

• Merge or close Update reference files for #5983 Regression#102
  For this build, the following CMake flags will be set
  -DREGRESSION_GIT_REPOSITORY='https://github.com/sofa-framework/Regression'
  -DREGRESSION_GIT_TAG='ecba55695046af5b5a36f60d8ef1189af42582f8'

[sofabot]

[ci-depends-on] detected during build #3.

To unlock the merge button, you must

• Merge or close Update reference files for #5983 Regression#102
  For this build, the following CMake flags will be set
  -DREGRESSION_GIT_REPOSITORY='https://github.com/sofa-framework/Regression'
  -DREGRESSION_GIT_TAG='ecba55695046af5b5a36f60d8ef1189af42582f8'

[fredroy]

[ci-build]

[sofabot]

[ci-depends-on] detected during build #4.

All dependencies are merged/closed. Congrats! 👍