chore(ETU-77981): Move to ubuntu 26.04 runner

.github/workflows/ci.yml

@@ -52,7 +52,7 @@ jobs:
       path: fixture/external-refs/openapi.yaml
 
   upload-artifact:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     steps:
       - uses: actions/checkout@v7
       - name: Save spec to the artifact storage
@@ -72,7 +72,7 @@ jobs:
       fail_threshold: warn
 
   upload-artifact-all:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     steps:
       - uses: actions/checkout@v7
       - name: Save all specs to the artifact storage

.github/workflows/lint.yml

@@ -26,7 +26,7 @@ on:
 jobs:
   lint:
     name: OpenAPI Lint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
       actions: read

.github/workflows/publish.yml

@@ -17,7 +17,7 @@ on:
 jobs:
   publish:
     name: OpenAPI Publish
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
       actions: read

.github/workflows/validate.yml

@@ -17,7 +17,7 @@ on:
 jobs:
   validate-spec:
     name: OpenAPI Validate
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
       actions: read