build(deps): bump ecdsa from 0.13 to 0.13.3 in /iceweasel

Bumps [ecdsa](https://github.com/warner/python-ecdsa) from 0.13 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...python-ecdsa-0.13.3)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

iceweasel/requirements-rf.txt

@@ -2,7 +2,7 @@ asn1crypto==0.24.0
 cffi==1.12.3
 cryptography==2.6.1
 decorator==4.4.0
-ecdsa==0.13
+ecdsa==0.13.3
 enum34==1.1.6
 ipaddress==1.0.22
 paramiko==2.0.2

iceweasel/requirements.txt

@@ -27,7 +27,7 @@ django-revproxy==0.9.15
 django-tables2==2.0.6
 django-webpack-loader==0.6.0
 djangorestframework==3.9.4
-ecdsa==0.13.2
+ecdsa==0.13.3
 elasticsearch==7.0.1
 elasticsearch-curator==3.5.1
 enum34==1.1.6