workflows: Move trigger-anaconda and ws build workflows to ubuntu-latest

This all runs in a docker container, and these are supported very well
on GitHub in all releases. So no need to pin this to a particular
Ubuntu release.

Author: martinpitt

.github/workflows/build-ws-container.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     environment: quay.io
     permissions: {}
     timeout-minutes: 20

.github/workflows/trigger-anaconda.yml

@@ -15,7 +15,7 @@ on:
       - pkg/storaged/**
 jobs:
   trigger:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     permissions:
       contents: read
       statuses: write