Bump tqdm from 4.46.1 to 4.66.3 in /docs

Bumps [tqdm](https://github.com/tqdm/tqdm) from 4.46.1 to 4.66.3.
- [Release notes](https://github.com/tqdm/tqdm/releases)
- [Commits](tqdm/tqdm@v4.46.1...v4.66.3)

---
updated-dependencies:
- dependency-name: tqdm
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -7,7 +7,7 @@ requests==2.22.0
 psycopg2==2.8.4
 scipy==1.4.1
 sqlalchemy==1.3.13
-tqdm==4.46.1
+tqdm==4.66.3
 pychadwick==0.3.0
 pytest==5.3.4
 tox==3.14.3