Replace ubuntu 18.04 to latest everywhere.

.github/workflows/manylinux_wheels.yml

@@ -14,7 +14,7 @@ env:
 jobs:
   kivy_examples_create:
     # we need examples wheel for tests, but only windows actually uploads kivy-examples to pypi/server
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python
@@ -45,23 +45,23 @@ jobs:
         source .ci/ubuntu_ci.sh &&
         yum install -y epel-release &&
         build_and_install_linux_kivy_sys_deps
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         os: [ubuntu-latest]
         cibw_archs: [auto]
         cibw_build: ['cp37-manylinux_x86_64 cp38-manylinux_x86_64 cp39-manylinux_x86_64 cp310-manylinux_x86_64']
         include:
-           - os: ubuntu-18.04
+           - os: ubuntu-latest
              cibw_archs: aarch64
              cibw_build: cp37-manylinux_aarch64
-           - os: ubuntu-18.04
+           - os: ubuntu-latest
              cibw_archs: aarch64
              cibw_build: cp38-manylinux_aarch64
-           - os: ubuntu-18.04
+           - os: ubuntu-latest
              cibw_archs: aarch64
              cibw_build: cp39-manylinux_aarch64
-           - os: ubuntu-18.04
+           - os: ubuntu-latest
              cibw_archs: aarch64
              cibw_build: cp310-manylinux_aarch64
     if: github.event_name == 'schedule' || (github.event_name == 'create' && github.event.ref_type == 'tag') || contains(github.event.head_commit.message, '[build wheel]') || contains(github.event.head_commit.message, '[build wheel linux]') || contains(github.event.pull_request.title, '[build wheel]') || contains(github.event.pull_request.title, '[build wheel linux]')
@@ -91,7 +91,7 @@ jobs:
         path: ./wheelhouse/*.whl
 
   manylinux_wheel_upload:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     needs: [manylinux_wheel_create, kivy_examples_create]
     if: github.event_name != 'pull_request'
     steps:
@@ -133,7 +133,7 @@ jobs:
         upload_artifacts_to_pypi
 
   manylinux_wheel_test:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     needs: [manylinux_wheel_create, kivy_examples_create]
     strategy:
       matrix:
@@ -182,7 +182,7 @@ jobs:
         path: .benchmarks-kivy
 
   sdist_test:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     env:
       DISPLAY: ':99.0'
       KIVY_SPLIT_EXAMPLES: 0