[docs] fix formatting of blockquotes

[jameslamb]

Fixes some formatting issues introduced in the docs added in #244

Before:

After:

Reference: https://restructuredtext.readthedocs.io/en/latest/rst_guide.html#blockquotes

While I'm in here, also:

• updates versions of dependencies for docs builds
• updates versions in pre-commit via pre-commit autoupdate

How I tested this

Enabled builds on readthedocs.

build: https://readthedocs.org/projects/pydistcheck/builds/24477913/
docs: https://pydistcheck.readthedocs.io/en/docs-fix/check-reference.html#path-too-long