Update vcpkg

windows/Dockerfile

@@ -56,7 +56,7 @@ RUN [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tl
 RUN $vcpkg_dir = 'C:/vcpkg'; \
     git clone --depth=1 https://github.com/BioroboticsLab/RF_vcpkg.git $vcpkg_dir; \
     cd $vcpkg_dir; \
-    git checkout 88ff5c4b6aa71384fa9b15bdfc26222db6147196; \
+    git checkout 6cfbc2b9e5e159ec259082723a2383c5d05f8f49; \
     ./scripts/bootstrap.ps1; \
     [Environment]::SetEnvironmentVariable('VCPKG_DIR', "\"$vcpkg_dir\"", [EnvironmentVariableTarget]::Machine);