Fix jsonschema version to match lower-constraint

The jsonschema lower constraint for train is version 3.0.2. This is
making some jobs fail because it can't install the diskimage-builder.

Closes-Bug: #2012489
Change-Id: I620265f6bb09966ff5eaafe9b7b5ee960d0a4977

lower-constraints.txt

@@ -13,7 +13,7 @@ imagesize==0.7.1
 iso8601==0.1.11
 isort==4.3.4
 Jinja2==2.10
-jsonschema==3.2.0
+jsonschema==3.0.2
 keystoneauth1==3.4.0
 lazy-object-proxy==1.3.1
 linecache2==1.0.0

requirements.txt

@@ -8,4 +8,4 @@ PyYAML>=3.12 # MIT
 stevedore>=1.20.0 # Apache-2.0
 # NOTE(ianw) in here because dib-lint uses flake8
 flake8<6.0.0,>=3.6.0 # MIT
-jsonschema>=3.2.0 # MIT
+jsonschema>=3.0.2 # MIT