Bump boto3 from 1.10.48 to 1.10.49

Bumps [boto3](https://github.com/boto/boto3) from 1.10.48 to 1.10.49.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.10.48...1.10.49)

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

requirements.txt

@@ -1,5 +1,5 @@
 asn1crypto==1.3.0
-boto3==1.10.48
+boto3==1.10.49
 bcrypt==3.1.7
 certifi==2019.11.28
 cffi==1.13.2