Update packages.json & build-matrix.html

docs/packages.json

@@ -129,7 +129,7 @@
     "hidapi": {"version": "a6a622f", "website": "https://github.com/signal11/hidapi/", "description": "HIDAPI"},
     "hunspell": {"version": "1.7.0", "website": "https://hunspell.github.io/", "description": "Hunspell"},
     "hyperscan": {"version": "4.3.2", "website": "https://01.org/hyperscan", "description": "Hyperscan"},
-    "icu4c": {"version": "56.1", "website": "https://ssl.icu-project.org/", "description": "ICU4C"},
+    "icu4c": {"version": "56.1", "website": "https://github.com/unicode-org/icu", "description": "ICU4C"},
     "id3lib": {"version": "3.8.3", "website": "https://id3lib.sourceforge.io/", "description": ""},
     "ilmbase": {"version": "2.2.0", "website": "https://www.openexr.com/", "description": "IlmBase"},
     "imagemagick": {"version": "7.0.8-63", "website": "https://www.imagemagick.org/", "description": "ImageMagick"},