build(deps): bump boto3 from 1.15.1 to 1.15.3 (#226)

Bumps [boto3](https://github.com/boto/boto3) from 1.15.1 to 1.15.3.
- [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/1.15.1...1.15.3)

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

@@ -74,11 +74,10 @@
         },
         "boto3": {
             "hashes": [
-                "sha256:44073b1b1823ffc9edcf9027afbca908dad6bd5000f512ca73f929f6a604ae24",
-                "sha256:888be45e289ba56c4e47cfae5d6b08f097bc981d077fbe6521a6d3dc7a4d757e"
+                "sha256:3f0d8dc7dec39876b7b224469639d8eef4dba1c2dc779a1b30fc73f99a18f742"
             ],
             "index": "pypi",
-            "version": "==1.15.1"
+            "version": "==1.15.3"
         },
         "botocore": {
             "hashes": [