Bump lxml from 4.5.1 to 4.6.2 (#1263)

Bumps [lxml](https://github.com/lxml/lxml) from 4.5.1 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-4.5.1...lxml-4.6.2)

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

requirements-no-torch.txt

@@ -1,7 +1,7 @@
 attrs==19.3.0
 bs4==0.0.1
 jsonnet==0.15.0
-lxml==4.5.1
+lxml==4.6.2
 datasets==1.1.2
 nltk>=3.5
 numexpr==2.7.1

setup.py

@@ -60,7 +60,7 @@
         "attrs == 19.3.0",
         "bs4 == 0.0.1",
         "jsonnet == 0.15.0",
-        "lxml == 4.5.1",
+        "lxml == 4.6.2",
         "datasets == 1.1.2",
         "nltk >= 3.5",
         "numexpr == 2.7.1",