Bump mercurial from 6.1.4 to 6.2.1 (#3015)

Bumps [mercurial](https://mercurial-scm.org/) from 6.1.4 to 6.2.1.

---
updated-dependencies:
- dependency-name: mercurial
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

requirements.txt

@@ -6,7 +6,7 @@ libmozdata==0.1.79
 lmdb==1.3.0
 markdown2==2.4.3
 matplotlib==3.5.2
-mercurial==6.1.4
+mercurial==6.2.1
 microannotate==0.0.24
 mozci==2.2.1
 numpy==1.22.4