FIX: update niworkflows location

[mgxd]

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Some of the fMRIPRep maintainers will review your changes as soon as time permits.
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PR Review

Please check off boxes as applicable, and elaborate in comments below. Your review is not limited to these topics, as described in the reviewer guide

• As the reviewer I confirm that there are no conflicts of interest for me to review this work.

Please check what applies in the following aspects of the PR:

Code documentation

• New functions and modules are documented following the guidelines.
• Existing code required amendments in documentation and has been updated.
• Sufficient inline comments ensure readability by other contributors in the long term.

Documentation site

• The modifications to fMRIPrep in this PR do not require extra documentation. This is a common situation when a bug fix that does not change the code base substantially is submitted.
• This PR requires documentation. The corresponding documentation will be submitted as an additional PR in the future.
• This PR requires extra documentation, and will be included within this PR. Please check the boxes that apply best:
  • An existing feature is substantially modified, changing the interface and/or logic of a module.
  • A new feature is being added, therefore full documentation of it will be included
  • This PR addresses an error in existing documentation.
• Yes, all expected sections of documentation were generated by the CI build, and look as expected

Tests

• The new functionalities in this PR are covered by the existing tests
• New test batteries have been included with this PR

Data

• This PR does not require any additional data to be uploaded to OSF.
• This PR requires additional data for tests.

Dependencies: smriprep

• This PR does not require any update on smriprep; or
• smriprep has correctly been pinned.

Dependencies: niworkflows

• This PR does not require any update on niworkflows; or
• niworkflows has correctly been pinned.

Dependencies: sdcflows

• This PR does not require any update on sdcflows; or
• sdcflows has correctly been pinned.

Dependencies: Nipype

• This PR does not require any update on nipype; or
• nipype has correctly been pinned.

Dependencies: other

• This PR does not require any update on other dependencies; or
• other dependencies have correctly been pinned.

Reports generated within CI tests

• Yes, I have checked the reports of ds005 and they are not modified or the changes are as expected
• Yes, I have checked the reports of ds054 and they are not modified or the changes are as expected
• Yes, I have checked the reports of ds010 and they are not modified or the changes are as expected