Update packages.json & build-matrix.html

docs/build-matrix.html

@@ -2949,7 +2949,7 @@ feel free to submit a pull request.
 
 <tr>
  <th class="row" title=""> nlopt   </th>
- <td>2.4.2 </td>
+ <td>2.6.1 </td>
       <td class="supported">&#x2713;</td>
       <td class="supported">&#x2713;</td>
       <td class="supported">&#x2713;</td>

docs/packages.json

@@ -290,7 +290,7 @@
     "netcdf-cxx4": {"version": "4.3.0", "website": "https://www.unidata.ucar.edu/software/netcdf/", "description": "NetCDF-CXX4"},
     "netpbm": {"version": "10.35.96", "website": "https://netpbm.sourceforge.io/", "description": "Netpbm"},
     "nettle": {"version": "3.5.1", "website": "https://www.lysator.liu.se/~nisse/nettle/", "description": ""},
-    "nlopt": {"version": "2.4.2", "website": "https://ab-initio.mit.edu/wiki/index.php/NLopt", "description": "NLopt"},
+    "nlopt": {"version": "2.6.1", "website": "https://nlopt.readthedocs.io/en/latest/", "description": "NLopt"},
     "nsis": {"version": "3.04", "website": "https://nsis.sourceforge.io/", "description": "NSIS"},
     "ocaml-cairo": {"version": "1.2.0", "website": "https://cairographics.org/cairo-ocaml/", "description": "cairo-ocaml"},
     "ocaml-camlimages": {"version": "4.0.1", "website": "http://gallium.inria.fr/camlimages", "description": "camlimages"},