Update spacy requirement from <3.1,>=2.1.0 to >=2.1.0,<3.2 (#5305)

Updates the requirements on [spacy](https://github.com/explosion/spaCy) to permit the latest version.
- [Release notes](https://github.com/explosion/spaCy/releases)
- [Commits](explosion/spaCy@v2.1.0...v3.1.0)

---
updated-dependencies:
- dependency-name: spacy
  dependency-type: direct:production
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Pete <petew@allenai.org>
Co-authored-by: Dirk Groeneveld <dirkg@allenai.org>

setup.py

@@ -56,7 +56,7 @@
         "jsonnet>=0.10.0 ; sys.platform != 'win32'",
         "overrides==3.1.0",
         "nltk",
-        "spacy>=2.1.0,<3.1",
+        "spacy>=2.1.0,<3.2",
         "numpy",
         "tensorboardX>=1.2",
         "boto3>=1.14,<2.0",