build: Bump aetna from 1.0.0-alpha.3 to 1.0.0-alpha.6 (#79)

Bumps [aetna](https://github.com/pressbooks/aetna) from 1.0.0-alpha.3 to 1.0.0-alpha.6.
- [Release notes](https://github.com/pressbooks/aetna/releases)
- [Commits](https://github.com/pressbooks/aetna/compare/1.0.0-alpha.3...1.0.0-alpha.6)

package-lock.json

@@ -284,9 +284,9 @@
       }
     },
     "aetna": {
-      "version": "1.0.0-alpha.3",
-      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.3.tgz",
-      "integrity": "sha512-2/2ymhwu74C3DYaX+6Y4b5j5jh0DaXnBWfyMh1DU2H64i2ib5dSKA2oYUFv1vQnL7niplxWUrmGBXaisL1i28Q==",
+      "version": "1.0.0-alpha.6",
+      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.6.tgz",
+      "integrity": "sha512-y9dwb4g1bt5Ntv3hnjLQlsfMH3fz1nFgzlPLA0oHwJzz07Ug398vjctGe+myA2ApPkJhnvjy8sfry0F9hRZXTg==",
       "requires": {
         "@frctl/fractal": "1.1.7"
       }