github: fix CI by updating Ubuntu

Ubuntu 18 is not supported anymore by GitHub actions.

Author: benma

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on: [push, pull_request]
 jobs:
   check:
     name: Check
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
@@ -30,7 +30,7 @@ jobs:
 
   lint:
     name: Lint
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
@@ -60,7 +60,7 @@ jobs:
 
   test:
     name: Test Suite
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
@@ -82,7 +82,7 @@ jobs:
 
   build-linux:
     name: Build linux release
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
@@ -111,7 +111,7 @@ jobs:
 
   release-linux:
     name: Release linux
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2