build: Bump aetna from 1.0.0-alpha.11 to 1.0.0-alpha.12 (#84 An error occurred )

Bumps [aetna](https://github.com/pressbooks/aetna) from 1.0.0-alpha.11 to 1.0.0-alpha.12.
- [Release notes](https://github.com/pressbooks/aetna/releases/tag/1.0.0-alpha.12)
- [Commits](https://github.com/pressbooks/aetna/compare/1.0.0-alpha.11...1.0.0-alpha.12)

package-lock.json

@@ -284,9 +284,9 @@
       }
     },
     "aetna": {
-      "version": "1.0.0-alpha.11",
-      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.11.tgz",
-      "integrity": "sha512-3A4OGkO1cUQDyDfmH7ziRmBGo7PyWmwuZZCXiSJTJyDM2DZInYYm5yxildZXSuKXo1EQ1tdgK6Aghy7++oc77A==",
+      "version": "1.0.0-alpha.12",
+      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.12.tgz",
+      "integrity": "sha512-WUH4mPCJwyEtlDSpetfnBzU17eRWMF7uLLyDeIE8Xs31uY9/npxdXIhteffcGN0MSia5dz35GDNIk6qzu7JzxA==",
       "requires": {
         "@frctl/fractal": "1.1.7"
       }

package.json

@@ -57,7 +57,7 @@
     "pressbooks-build-tools": "^0.10.0"
   },
   "dependencies": {
-    "aetna": "^1.0.0-alpha.11",
+    "aetna": "^1.0.0-alpha.12",
     "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.11:
-  version "1.0.0-alpha.11"
-  resolved "https://registry.yarnpkg.com/aetna/-/aetna-1.0.0-alpha.11.tgz#98b722e141013d01a6212235bd62e2a5dec5c160"
+aetna@^1.0.0-alpha.12:
+  version "1.0.0-alpha.12"
+  resolved "https://registry.yarnpkg.com/aetna/-/aetna-1.0.0-alpha.12.tgz#6e73444d3131637d8f5a1717b66dbe4f8d67f9bd"
   dependencies:
     "@frctl/fractal" "^1.1.7"