fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-EXPRESS-6474509
- https://snyk.io/vuln/SNYK-JS-JSON5-3182856

package.json

@@ -21,7 +21,7 @@
 	"dependencies": {
 		"@babel/core": "^7.8.3",
 		"@storybook/addon-knobs": "5.3.21",
-		"@storybook/vue": "5.3.21",
+		"@storybook/vue": "7.6.17",
 		"@tournant/communard": "^2.2.0",
 		"@vue/babel-preset-app": "^4.1.2",
 		"@vue/cli-plugin-babel": "^4.1.2",