Bump orjson from 3.4.5 to 3.4.6 (#2012)

Bumps [orjson](https://github.com/ijl/orjson) from 3.4.5 to 3.4.6.
- [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/3.4.5...3.4.6)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -9,7 +9,7 @@ mercurial==5.6.1
 microannotate==0.0.23
 mozci==1.11.3
 numpy==1.19.4
-orjson==3.4.5
+orjson==3.4.6
 ortools==8.0.8283
 pandas==1.1.4
 psutil==5.7.3