[ENH] update toy BIDS App version used for CircleCI testing

[zhao-cy]

Changes in this PR

• The Docker image for CircleCI testing is upgraded to version datalad0.17.2_v5, with toybidsapp version 0.0.7 sif file included.
• The example toybidsapp YAML files (unzipped and zipped dataset) are updated too:
  • changed the version to 0.0.7 too;
  • added --dummy argument;
• Also fixed the readthedocs error due to the new release of urlib3. See below for more.

Therefore, if you use the latest example YAML files for toy BIDS App, make sure you are also using the latest version of toy BIDS App (0.0.7)!

[zhao-cy]

Fixed the readthedocs build error: Followed how XCP fixed this error.

Details see: PennLINC/xcp_d/pull/877