Fix: [CI] force a CMake minimum version of 3.5 for all dependencies (#13936)

With CMake 4.0.0, any project < 3.5 is no longer supported. Yet,
some projects indicate 3.0 or 3.1 (while fully compatible with
3.5+). But CMake doesn't know, so it bails.

.github/workflows/release-linux.yml

@@ -136,7 +136,10 @@ jobs:
         cd build
 
         echo "::group::CMake"
-        cmake ${GITHUB_WORKSPACE} \
+        # CMake 4.0.0 deprecated < 3.5, but some vcpkg packages still use it.
+        # Yet, they are fully compatible with 3.5, and so there is no problem
+        # forcing them to upgrade.
+        CMAKE_POLICY_VERSION_MINIMUM=3.5 cmake ${GITHUB_WORKSPACE} \
           -DCMAKE_TOOLCHAIN_FILE=/vcpkg/scripts/buildsystems/vcpkg.cmake \
           -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           -DOPTION_SURVEY_KEY=${{ inputs.survey_key }} \