[CI][stable-only] Fix py311 and validate jobs

The two jobs are failing with error:

ModuleNotFoundError: No module named 'pkg_resources'

This is because recent setuptools (>=82.0.0) dropped pkg_resource
module from its source. Hence the workaround is to cap it for py311
and validate jobs.

Change-Id: I80b7aa537610ac5d35fa1b4c04f5246ec85a170e
Signed-off-by: Elod Illes <elod.illes@est.tech>

Author: Elod Illes

tox.ini

@@ -12,6 +12,12 @@ deps = -c{toxinidir}/upper-constraints.txt
 commands =
   stestr run {posargs}
 
+[testenv:py311]
+deps = -c{toxinidir}/upper-constraints.txt
+       -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+       setuptools<82.0.0
+
 [testenv:py38-check-uc]
 allowlist_externals =
   check-conflicts
@@ -56,6 +62,10 @@ commands = generate-constraints {posargs: -b blacklist.txt -r global-requirement
 [testenv:validate]
 allowlist_externals =
   validate-constraints
+deps = -c{toxinidir}/upper-constraints.txt
+       -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+       setuptools<82.0.0
 commands =
     validate-constraints {toxinidir}/global-requirements.txt {toxinidir}/upper-constraints.txt {toxinidir}/blacklist.txt