Automated Changelog Entry for 6.4.3 on master (#6135)

* Automated Changelog Entry for 6.4.3 on master

* Update CHANGELOG.md

Co-authored-by: GitHub Action <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Steven Silvester <ssilvester@apple.com>

Author: 3 people

CHANGELOG.md

@@ -14,6 +14,27 @@ Use `pip install pip --upgrade` to upgrade pip. Check pip version with
 
 <!-- <START NEW CHANGELOG ENTRY> -->
 
+## 6.4.3
+
+([Full Changelog](https://github.com/jupyter/notebook/compare/v6.4.2...c373bd89adaaddffbb71747ebbcfe8a749cae0a8))
+
+### Bugs fixed
+
+- Add @babel/core dependency [#6133](https://github.com/jupyter/notebook/pull/6133) ([@afshin](https://github.com/afshin))
+- Switch webpack to production mode [#6131](https://github.com/jupyter/notebook/pull/6131) ([@afshin](https://github.com/afshin))
+
+### Maintenance and upkeep improvements
+
+- Clean up link checking [#6130](https://github.com/jupyter/notebook/pull/6130) ([@blink1073](https://github.com/blink1073))
+
+### Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/jupyter/notebook/graphs/contributors?from=2021-08-06&to=2021-08-10&type=c))
+
+[@afshin](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Aafshin+updated%3A2021-08-06..2021-08-10&type=Issues) | [@blink1073](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ablink1073+updated%3A2021-08-06..2021-08-10&type=Issues) | [@Zsailer](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3AZsailer+updated%3A2021-08-06..2021-08-10&type=Issues)
+
+<!-- <END NEW CHANGELOG ENTRY> -->
+
 ## 6.4.2
 
 ([Full Changelog](https://github.com/jupyter/notebook/compare/v6.4.0...999e8322bcd24e0ed62b180c19ec13db3f48165b))
@@ -36,8 +57,6 @@ Use `pip install pip --upgrade` to upgrade pip. Check pip version with
 
 [@afshin](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Aafshin+updated%3A2021-05-17..2021-08-06&type=Issues) | [@Amr-Ibra](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3AAmr-Ibra+updated%3A2021-05-17..2021-08-06&type=Issues) | [@frenzymadness](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Afrenzymadness+updated%3A2021-05-17..2021-08-06&type=Issues) | [@ilayh123](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ailayh123+updated%3A2021-05-17..2021-08-06&type=Issues) | [@kevin-bates](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Akevin-bates+updated%3A2021-05-17..2021-08-06&type=Issues) | [@Nazeeh21](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3ANazeeh21+updated%3A2021-05-17..2021-08-06&type=Issues) | [@saiwing-yeung](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Asaiwing-yeung+updated%3A2021-05-17..2021-08-06&type=Issues)
 
-<!-- <END NEW CHANGELOG ENTRY> -->
-
 ## 6.4.0
 
 ([Full Changelog](https://github.com/jupyter/notebook/compare/6.3.0...80eb286f316838afc76a9a84b06f54e7dccb6c86))