gitian: Version bump for Qt dependency

Bump Qt dependency version after OpenSSL update.
Very important. Thanks @Michagogo for noting.

contrib/gitian-descriptors/gitian-win.yml

@@ -22,8 +22,8 @@ remotes:
 - "url": "https://github.com/bitcoin/bitcoin.git"
   "dir": "bitcoin"
 files:
-- "qt-win32-5.2.0-gitian-r2.zip"
-- "qt-win64-5.2.0-gitian-r2.zip"
+- "qt-win32-5.2.0-gitian-r3.zip"
+- "qt-win64-5.2.0-gitian-r3.zip"
 - "boost-win32-1.55.0-gitian-r6.zip"
 - "boost-win64-1.55.0-gitian-r6.zip"
 - "bitcoin-deps-win32-gitian-r11.zip"
@@ -59,7 +59,7 @@ script: |
     mkdir -p $STAGING $BUILDDIR $BINDIR
     #
     cd $STAGING
-    unzip $INDIR/qt-win${BITS}-5.2.0-gitian-r2.zip
+    unzip $INDIR/qt-win${BITS}-5.2.0-gitian-r3.zip
     unzip $INDIR/boost-win${BITS}-1.55.0-gitian-r6.zip
     unzip $INDIR/bitcoin-deps-win${BITS}-gitian-r11.zip
     unzip $INDIR/protobuf-win${BITS}-2.5.0-gitian-r4.zip

contrib/gitian-descriptors/qt-win.yml

@@ -86,7 +86,7 @@ script: |
     export LD_PRELOAD=/usr/lib/faketime/libfaketime.so.1
     export FAKETIME=$REFERENCE_DATETIME
     find -print0 | xargs -r0 touch # fix up timestamps before packaging
-    find | sort | zip -X@ $OUTDIR/qt-win${BITS}-5.2.0-gitian-r2.zip
+    find | sort | zip -X@ $OUTDIR/qt-win${BITS}-5.2.0-gitian-r3.zip
     unset LD_PRELOAD
     unset FAKETIME
   done # for BITS in