Bump lxml from 4.6.1 to 4.6.2 in /src/sonic-config-engine (#6385)

Bumps [lxml](https://github.com/lxml/lxml) from 4.6.1 to 4.6.2.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.6.1...lxml-4.6.2)

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

src/sonic-config-engine/setup.py

@@ -7,7 +7,7 @@
 dependencies = [
     'bitarray==1.5.3',
     'ipaddress==1.0.23',
-    'lxml==4.6.1',
+    'lxml==4.6.2',
     'netaddr==0.8.0',
     'pyyaml==5.3.1',
     'sonic-py-common',