Update notebooks submodule

[ethanwharris]

What does this PR do?

Updates the notebooks submodule and docs config to explicitly filter in the notebook directories that we want.

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Fixes #1

cc @Borda

[github-actions]

Build Error! No Linked Issue found. Please link an issue or mention it in the body using #<issue_id>

[carmocca]

Do we need this in the bug-fix release? Set the appropriate milestone.