Replace the existing color picker - spectrum-colorpicker with @simonwep/pickr.

spectrum-colorpicker has accessibility issues and is not maintained since long

Part of #5197

web/pgadmin/static/css/style.css

@@ -9,7 +9,6 @@
 @import '~jquery-contextmenu/dist/jquery.contextMenu.css';
 @import '~webcabin-docker/Build/wcDocker.css';
 @import '~acitree/css/aciTree.css';
-@import '~spectrum-colorpicker/spectrum.css';
 @import '~leaflet/dist/leaflet.css';
 
 @import '~codemirror/lib/codemirror.css';