ci: update ubuntu and action versions

Signed-off-by: Patrizio Bekerle <[email protected]>

Author: pbek

.github/workflows/build.yml

@@ -15,11 +15,11 @@ jobs:
     strategy:
       matrix:
         qt_version: [5.12.11, 5.15.2, 6.2.0]
-        platform: [ubuntu-20.04, windows-latest, macos-latest]
+        platform: [ubuntu-latest, windows-latest, macos-latest]
         include:
           - qt_version: 6.2.0
             additional_arguments: -D QT_DEFAULT_MAJOR_VERSION=6
-          - platform: ubuntu-20.04
+          - platform: ubuntu-latest
             make: make
             CXXFLAGS: -Wall -Wextra -pedantic -Werror
             MAKEFLAGS: -j2
@@ -38,10 +38,10 @@ jobs:
 
     steps:
       - name: Clone repo
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2
 
       - name: Install Qt
-        uses: jurplel/install-qt-action@v2.14.0
+        uses: jurplel/install-qt-action@v4
         with:
           version: ${{ matrix.qt_version }}