Drop check-uc jobs for py38

Python3.8 is no longer part of the PTI and some libraries are dropping
support for it in new releases. Make our life easy and stop generating
and checking constraints for it rather than reintroducing python_version
specific constraints again.

Change-Id: Iee6b65ad1cac13df33ea96119f3cf4b70e2e307e

.zuul.d/jobs.yaml

@@ -12,16 +12,6 @@
     vars:
       tox_envlist: babel
 
-- job:
-    name: requirements-tox-py38-check-uc
-    parent: openstack-tox-py38
-    description: |
-      Run test for requirements project.
-
-      Uses tox with the ``py38-check-uc`` environment.
-    files: ^upper-constraints.*txt$
-    vars:
-      tox_envlist: py38-check-uc
 - job:
     name: requirements-tox-py39-check-uc
     parent: openstack-tox-py39
@@ -64,9 +54,3 @@
     files: ^bindep.txt$
     vars:
       tox_envlist: bindep
-
-- job:
-    name: requirements-tox-py38-check-uc-aarch64
-    parent: requirements-tox-py38-check-uc
-    nodeset: ubuntu-focal-arm64
-    timeout: 7200

.zuul.d/project.yaml

@@ -28,7 +28,6 @@
         - requirements-tox-babel
         - requirements-tox-bindep:
             voting: false
-        - requirements-tox-py38-check-uc
         - requirements-tox-py39-check-uc
         - requirements-tox-py310-check-uc
         - requirements-tox-validate-projects:
@@ -65,10 +64,6 @@
               - ^setup.cfg$
     check-arm64:
       jobs:
-        - requirements-tox-py38-check-uc-aarch64:
-            files:
-              - bindep.txt
-              - upper-constraints.txt
         - build-wheel-cache-centos-8-stream-arm64:
             files:
               - bindep.txt
@@ -109,7 +104,6 @@
               - bindep.txt
         - openstack-tox-validate
         - requirements-tox-babel
-        - requirements-tox-py38-check-uc
         - requirements-tox-py39-check-uc
         - requirements-tox-py310-check-uc
         - cross-cinder-py310

tox.ini

@@ -16,13 +16,6 @@ deps = -c{toxinidir}/upper-constraints.txt
 commands =
   stestr run {posargs}
 
-[testenv:py38-check-uc]
-allowlist_externals =
-  check-conflicts
-basepython = python3.8
-deps = -r{toxinidir}/upper-constraints.txt
-commands = check-conflicts {toxinidir}/upper-constraints.txt {toxinidir}/upper-constraints-xfails.txt
-
 [testenv:py39-check-uc]
 allowlist_externals =
   check-conflicts
@@ -50,7 +43,7 @@ description = Regenerates upper-constraints.txt
 # Generate needs an unconstrained install to get new dependencies
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = generate-constraints {posargs: -b blacklist.txt -r global-requirements.txt -p python3.6 -p python3.7 -p python3.8 -p python3.9 -p python3.10 > upper-constraints.txt}
+commands = generate-constraints {posargs: -b blacklist.txt -r global-requirements.txt -p python3.9 -p python3.10 > upper-constraints.txt}
 
 [testenv:validate]
 allowlist_externals =