chore(ci): running on latest ubuntu

Signed-off-by: Dario Tranchitella <dario@tranchitella.eu>

Author: prometherion

.github/workflows/ci.yaml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
         with:

.github/workflows/helm.yaml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   lint:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
         with:
@@ -34,7 +34,7 @@ jobs:
           echo -e '\033[0;32mDocumentation up to date\033[0m ✔'
   release:
     if: startsWith(github.ref, 'refs/tags/helm-v')
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - name: Publish Helm chart