Update workflow configurations to use Ubuntu 22.04

Author: YukiTsuchida

.github/workflows/demo.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 jobs:
   demo:
     name: demo
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Set up Go 1.16
         uses: actions/setup-go@v1
@@ -48,7 +48,7 @@ jobs:
           make demo
   unit-test:
     name: unit-test
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Set up Go 1.16
         uses: actions/setup-go@v2

.github/workflows/zip.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   zip:
       name: zip
-      runs-on: ubuntu-20.04
+      runs-on: ubuntu-22.04
       env:
         ARTIFACT_NAME: fabric-besu-cross-demo
       steps: