updating ubuntu runners

Author: Andy Kruth

.github/workflows/build.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   build:
     name: Build the project
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v2

.github/workflows/release-patch.yml

@@ -5,7 +5,7 @@ on: [workflow_dispatch]
 jobs:
   build:
     name: Release
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v2

.github/workflows/release.yml

@@ -15,7 +15,7 @@ on:
 jobs:
   build:
     name: Release
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v2