check.yml: bump actions/checkout version and replace deprecated 18.04 runner with 20.04

.github/workflows/check.yml

@@ -52,7 +52,7 @@ jobs:
         # One of the tests wants this
         sudo mkdir /tmp/flatpak-com.example.App-OwnedByRoot
     - name: Check out flatpak
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
       with:
         submodules: true
     - name: Build appstream dependency # (We need at least 0.15.3 for the g_once fix)
@@ -105,7 +105,7 @@ jobs:
   # * Disable malcontent build-dependency
   check-alt2:
     name: Build with gcc and test (older)
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
     - name: Install Dependencies
       run: |
@@ -120,7 +120,7 @@ jobs:
         # One of the tests wants this
         sudo mkdir /tmp/flatpak-com.example.App-OwnedByRoot
     - name: Check out flatpak
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
       with:
         submodules: true
     - name: Create logs dir
@@ -169,7 +169,7 @@ jobs:
     permissions:
       security-events: write # for codeql
     name: Build with clang and analyze
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
@@ -198,7 +198,7 @@ jobs:
         libseccomp-dev libsoup2.4-dev libcurl4-openssl-dev libsystemd-dev libxml2-utils libgpgme11-dev gobject-introspection \
         libgirepository1.0-dev libappstream-dev libdconf-dev clang e2fslibs-dev
     - name: Check out flatpak
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
       with:
         submodules: true
     - name: configure
@@ -229,7 +229,7 @@ jobs:
         libgirepository1.0-dev libappstream-dev libdconf-dev clang socat meson libdbus-1-dev \
         valgrind e2fslibs-dev
     - name: Check out flatpak
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
       with:
         submodules: true
     - name: Create logs dir