Bump lmdb from 1.3.0 to 1.4.0 (#3214)

Bumps [lmdb](https://github.com/jnwatson/py-lmdb) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/jnwatson/py-lmdb/releases)
- [Changelog](https://github.com/jnwatson/py-lmdb/blob/py-lmdb_1.4.0/ChangeLog)
- [Commits](https://github.com/jnwatson/py-lmdb/compare/py-lmdb_1.3.0...py-lmdb_1.4.0)

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

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requirements.txt

@@ -3,7 +3,7 @@ beautifulsoup4==4.11.1
 boto3==1.26.22
 imbalanced-learn==0.10.1
 libmozdata==0.1.83
-lmdb==1.3.0
+lmdb==1.4.0
 markdown2==2.4.6
 matplotlib==3.6.2
 mercurial==6.3.1