Update vcpkg due version that should work around msys2 repo being down

windows-1809/base/Dockerfile

@@ -48,6 +48,6 @@ RUN [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tl
 RUN $vcpkg_dir = 'C:/vcpkg'; \
     git clone https://git.imp.fu-berlin.de/bioroboticslab/robofish/vcpkg.git $vcpkg_dir; \
     cd $vcpkg_dir; \
-    git checkout cf0d3656f27287943a5c65f1158314845ae96ad4; \
+    git checkout 1f706ef54a19a15cc66c21abd96c276968a53cda; \
     ./scripts/bootstrap.ps1; \
     [Environment]::SetEnvironmentVariable('VCPKG_DIR', "\"$vcpkg_dir\"", [EnvironmentVariableTarget]::Machine);