build: try installing jsoncpp with vcpkg (3)

.github/workflows/continuous-building.yml

@@ -25,17 +25,17 @@ jobs:
       USE_ASAN: ${{ matrix.use-asan }}
       VCPKG_CMAKE_FILE: '${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake'
     steps:
-    - name: 'Install vcpkg + the packages we need from it'
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: 'Install vcpkg + the packages specified in vcpkg.json'
       uses: lukka/run-vcpkg@v11
       with:
         vcpkgDirectory: '${{ github.workspace }}/vcpkg'
         vcpkgGitCommitId: cf4ebef2294e164875ce17d7937f44d3e3ea156e
         runVcpkgInstall: true
 
-    - uses: actions/checkout@v4
-      with:
-        submodules: recursive
-
     - name: 'Linux: Install Qt5'
       if: startsWith(matrix.os, 'ubuntu-')
       run: |