Update tqdm requirement from ~=4.55 to ~=4.56

Updates the requirements on [tqdm](https://github.com/tqdm/tqdm) to permit the latest version.
- [Release notes](https://github.com/tqdm/tqdm/releases)
- [Commits](tqdm/tqdm@v4.55.0...v4.56.0)

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

requirements.txt

@@ -3,5 +3,5 @@ click~=7.1
 click-completion~=0.5.2
 optimade[mongo]~=0.12.6
 pymatgen==2020.12.31
-tqdm~=4.55
+tqdm~=4.56
 uvicorn~=0.13.3