Update devDependencies

* @babel/cli                   ^7.14.8  →  ^7.15.5
* @babel/core                  ^7.14.8  →  ^7.15.4
* @babel/preset-env            ^7.14.8  →  ^7.15.6
* @rollup/plugin-commonjs      ^19.0.1  →  ^20.0.0
* @rollup/plugin-node-resolve  ^13.0.2  →  ^13.0.4
* autoprefixer                 ^10.3.1  →  ^10.3.4
* clean-css-cli                 ^5.3.0  →   ^5.3.3
* eslint                       ^7.31.0  →  ^7.32.0
* eslint-config-xo             ^0.37.0  →  ^0.38.0
* eslint-plugin-import         ^2.23.4  →  ^2.24.2
* eslint-plugin-unicorn        ^34.0.1  →  ^36.0.0
* hugo-bin                     ^0.74.0  →  ^0.76.1
* qunit                        ^2.16.0  →  ^2.17.1
* postcss                       ^8.3.5  →   ^8.3.6
* rollup                       ^2.53.3  →  ^2.56.3
* vnu-jar                      21.6.11  →   21.9.2

build/vnu-jar.js

@@ -29,7 +29,11 @@ execFile('java', ['-version'], (error, stdout, stderr) => {
     'Attribute “autocomplete” not allowed on element “button” at this point.',
     // IE11 doesn't recognise <main> / give the element an implicit "main" landmark.
     // Explicit role="main" is redundant for other modern browsers, but still valid.
-    'The “main” role is unnecessary for element “main”.'
+    'The “main” role is unnecessary for element “main”.',
+    // Per https://www.w3.org/TR/html-aria/#docconformance having "aria-disabled" on a link is
+    // NOT RECOMMENDED, but it's still valid - we explain in the docs that it's not ideal,
+    // and offer more robust alternatives, but also need to show a less-than-ideal example
+    'An “aria-disabled” attribute whose value is “true” should not be specified on an “a” element that has an “href” attribute.'
   ].join('|')
 
   const args = [