Downgrade ubuntu to avoid broken runner

Author: TRowbotham

.github/workflows/coverage.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: true
       matrix:
         os:
-          - ubuntu-latest
+          - ubuntu-22.04
         arch:
           - amd64
           - i386

.github/workflows/tests.yml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: true
       matrix:
         os:
-          - ubuntu-latest
+          - ubuntu-22.04
         arch:
           - amd64
           - i386
@@ -34,7 +34,7 @@ jobs:
           - off
         include:
           - php: nightly
-            os: ubuntu-latest
+            os: ubuntu-22.04
             arch: amd64
             php-jit: on