update actions runner to ubuntu-latest (#989)

to avoid runner deprecations

Fixes AB#10623

Author: waarg

.github/workflows/deploy-github.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2

.github/workflows/test-build.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2