install libhandy dep on msys

.github/workflows/ci.yml

@@ -33,6 +33,7 @@ jobs:
             mingw-w64-x86_64-curl
             mingw-w64-x86_64-zlib
             mingw-w64-x86_64-gtkmm3
+            mingw-w64-x86_64-libhandy
 
       - name: Build
         run: |

ci/msys-deps.txt

@@ -31,6 +31,7 @@
 /bin/libgraphite2.dll
 /bin/libgtk-3-0.dll
 /bin/libgtkmm-3.0-1.dll
+/bin/libhandy-1-0.dll
 /bin/libharfbuzz-0.dll
 /bin/libiconv-2.dll
 /bin/libidn2-0.dll