build(deps): bump boto3 from 1.13.20 to 1.13.21 (#47)

Bumps [boto3](https://github.com/boto/boto3) from 1.13.20 to 1.13.21.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/boto3/compare/1.13.20...1.13.21)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Pipfile.lock

@@ -53,11 +53,11 @@
         },
         "boto3": {
             "hashes": [
-                "sha256:26f8564b46d009b8f4c6470a6d6cde147b282a197339c7e31cbb0fe9fd9e5f5d",
-                "sha256:f59d0bd230ed3a4b932c5c4e497a0e0ff3c93b46b7e8cde54efb6fe10c8266ba"
+                "sha256:45e851db4b4ea6cedc9e138f6aa93fedaa5a8e0ae6d8a3f893b3e27c6aff60c8",
+                "sha256:86de0882ba324ba4ced362b5c94491b8d126d378f2ee24d32486cb64b160a89f"
             ],
             "index": "pypi",
-            "version": "==1.13.20"
+            "version": "==1.13.21"
         },
         "botocore": {
             "hashes": [