Update third party npm dependencies.

The following dependencies are updated:

* jsxgraph: 1.10.1 -> 1.11.1
* plotly.js-dist-min: 2.23.0 -> 3.1.0
* sortablejs: 1.15.2 -> 1.15.6
* autoprefixer: 10.4.19 -> 10.4.21
* chokidar: 3.6.0 -> 4.0.3
* cssnano: 6.1.2 -> 7.1.0
* postcss: 8.4.38 -> 8.5.6
* prettier: 3.2.5 -> 3.6.2
* rtlcss: 4.1.1 -> 4.3.0
* sass: 1.75.0 -> 1.90.0
* terser: 5.30.4 -> 5.43.1
* yargs: 17.7.2 -> 18.0.0

All libraries are now at their latest version.

Note that the only change to the PG code required is a minor change to
the generate-assets.js script due to a change in the usage of yargs.

Author: drgrice1

htdocs/generate-assets.js

@@ -2,7 +2,8 @@
 
 /* eslint-env node */
 
-const yargs = require('yargs');
+const yargs = require('yargs/yargs');
+const { hideBin } = require('yargs/helpers');
 const chokidar = require('chokidar');
 const path = require('path');
 const { minify } = require('terser');
@@ -14,7 +15,7 @@ const postcss = require('postcss');
 const rtlcss = require('rtlcss');
 const cssMinify = require('cssnano');
 
-const argv = yargs
+const argv = yargs(hideBin(process.argv))
 	.usage('$0 Options')
 	.version(false)
 	.alias('help', 'h')

htdocs/js/MathQuill/mqeditor.js

@@ -550,7 +550,15 @@
 					toolbarEnabled = !toolbarEnabled;
 					localStorage.setItem('MQEditorToolbarEnabled', toolbarEnabled);
 					if (!toolbarEnabled && answerQuill.toolbar) toolbarRemove();
-					menu.hide();
+					// Bootstrap tries to focus the triggering element after hiding the menu. However, the menu gets
+					// disposed of and the hidden link which is the triggering element removed too quickly in the
+					// hidden.bs.dropdown event, and that causes an exception. So ignore that exception so that the
+					// answerQuill textarea is focused instead.
+					try {
+						menu.hide();
+					} catch {
+						/* ignore */
+					}
 					answerQuill.textarea.focus();
 				},
 				{ once: true }