Bump ecdsa from 0.13.2 to 0.13.3 in /micronets-gw-service (#42)

Bumps [ecdsa](https://github.com/warner/python-ecdsa) from 0.13.2 to 0.13.3.
- [Release notes](https://github.com/warner/python-ecdsa/releases)
- [Changelog](https://github.com/warner/python-ecdsa/blob/master/NEWS)
- [Commits](tlsfuzzer/python-ecdsa@python-ecdsa-0.13.2...python-ecdsa-0.13.3)

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

micronets-gw-service/requirements.txt

@@ -22,7 +22,7 @@ aiohttp==3.6.2
   yarl==1.3.0
     idna==2.8
     multidict==4.5.2
-ecdsa==0.13.2
+ecdsa==0.13.3
 netaddr==0.7.19
 netifaces==0.10.9
 pathlib==1.0.1