Bump orjson from 2.1.2 to 2.1.3 (#1099)

Bumps [orjson](https://github.com/ijl/orjson) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/ijl/orjson/releases)
- [Changelog](https://github.com/ijl/orjson/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ijl/orjson/compare/2.1.2...2.1.3)

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

requirements.txt

@@ -3,7 +3,7 @@ libmozdata==0.1.60
 matplotlib==3.1.1
 microannotate==0.0.18
 numpy==1.17.4
-orjson==2.1.2
+orjson==2.1.3
 pandas==0.25.3
 pydriller==1.9.2
 pyOpenSSL>=0.14  # Could not find a version that satisfies the requirement pyOpenSSL>=0.14; extra == "security" (from requests[security]>=2.7.0->libmozdata==0.1.43)