Set ubuntu-latest

.github/workflows/workflow.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
     - name: Checkout
       uses: actions/checkout@v2
@@ -38,7 +38,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -71,7 +71,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -96,7 +96,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -120,7 +120,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
       - name: Checkout
         uses: actions/checkout@v2