build: Bump aetna from 1.0.0-alpha.7 to 1.0.0-alpha.9

Bumps [aetna](https://github.com/pressbooks/aetna) from 1.0.0-alpha.7 to 1.0.0-alpha.9.
- [Release notes](https://github.com/pressbooks/aetna/releases)
- [Commits](https://github.com/pressbooks/aetna/compare/1.0.0-alpha.7...1.0.0-alpha.9)

package-lock.json

@@ -284,9 +284,9 @@
       }
     },
     "aetna": {
-      "version": "1.0.0-alpha.7",
-      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.7.tgz",
-      "integrity": "sha512-Y5g4ndWyX6c3GWR7YJT7Yn5p0SWNSEigRHXbKX6lUKaMe7K0HzL/A6MJm44iFa5mmuGS8uQFHFxdq0mLvHJWOg==",
+      "version": "1.0.0-alpha.9",
+      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.9.tgz",
+      "integrity": "sha512-niVpHMArfC6214OblkT6vs4S2/22twYydC9wWVRcVHAeUAblQXd2TDuAScjLg4FPpI32ICYcOZzWYo4nBIkegg==",
       "requires": {
         "@frctl/fractal": "1.1.7"
       }

package.json

@@ -57,7 +57,7 @@
     "pressbooks-build-tools": "^0.10.0"
   },
   "dependencies": {
-    "aetna": "^1.0.0-alpha.7",
+    "aetna": "^1.0.0-alpha.9",
     "isotope-layout": "^3.0.5",
     "jquery-bridget": "^2.0.1",
     "js-cookie": "^2.2.0",

yarn.lock

@@ -178,9 +178,9 @@ adjust-sourcemap-loader@^1.1.0:
     object-path "^0.9.2"
     regex-parser "^2.2.1"
 
-aetna@^1.0.0-alpha.7:
-  version "1.0.0-alpha.7"
-  resolved "https://registry.yarnpkg.com/aetna/-/aetna-1.0.0-alpha.7.tgz#5f18cae26b417b439a7cd56cc44a46590c7cfa7c"
+aetna@^1.0.0-alpha.9:
+  version "1.0.0-alpha.9"
+  resolved "https://registry.yarnpkg.com/aetna/-/aetna-1.0.0-alpha.9.tgz#ac1308ac2812b25e56180f13d244e41b291d5707"
   dependencies:
     "@frctl/fractal" "^1.1.7"