update glm_linear target

[reshamas]

{Insert Description}

Update "GLM_linear" target to "glm_target"

REF: https://github.com/pymc-devs/pymc/pull/6714 https://github.com/pymc-devs/pymc/issues/6663

• [ ] Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• [ ] PR description contains a link to the relevant issue:
  • a tracker one for existing notebooks (tracker issues have the "tracker id" label)
  • or a proposal one for new notebooks
• [ ] Check the notebook is not excluded from any pre-commit check: https://github.com/pymc-devs/pymc-examples/blob/main/.pre-commit-config.yaml

Helpful links

• https://github.com/pymc-devs/pymc-examples/blob/main/CONTRIBUTING.md