change ci/cd to ubuntu-20.04

Author: hibo98

.github/workflows/build-devel.yml

@@ -12,7 +12,7 @@ env:
 jobs:
   build:
 
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/build-release.yml

@@ -9,7 +9,7 @@ name: Release Job
 jobs:
   build:
     name: Build
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - name: Build project