GH Actions: Removed Ubuntu 18.04 and Updated to v4 workflows (#23)

Author: FlorianReimold

.github/workflows/build-macos.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules:  'true'
         fetch-depth: 0

.github/workflows/build-ubuntu.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         library_type: [static, shared]
-        os: [ubuntu-22.04, ubuntu-20.04, ubuntu-18.04]
+        os: [ubuntu-22.04, ubuntu-20.04]
 
     # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
     # You can convert this to a matrix build if you need cross-platform coverage.
@@ -64,7 +64,7 @@ jobs:
       shell: bash
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules:  'true'
         fetch-depth: 0
@@ -104,7 +104,7 @@ jobs:
       working-directory: ${{github.workspace}}/_build/_package/
 
     - name: Upload binaries
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ env.PROJECT_NAME }}-${{ env.CMAKE_PROJECT_VERSION }}-${{ matrix.os }}-${{ env.package_postfix }}
         path: ${{github.workspace}}/_build/_package/*.deb

.github/workflows/build-windows.yml

@@ -41,7 +41,7 @@ jobs:
         }
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules:  'true'
         fetch-depth: 0
@@ -81,7 +81,7 @@ jobs:
         echo "CMAKE_PROJECT_VERSION=$cmake_project_version"  >> "$Env:GITHUB_ENV"
 
     - name: Upload binaries
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ env.PROJECT_NAME }}-${{ env.CMAKE_PROJECT_VERSION }}-windows-${{ matrix.build_arch }}-${{ env.VS_NAME }}-${{ matrix.library_type }}
         path: ${{github.workspace}}/${{env.INSTALL_PREFIX}}