Update dependency gulp-svgstore to v9

Author: renovate[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "gray-matter": "4.0.3",
     "gulp": "4.0.2",
     "gulp-sass": "5.1.0",
-    "gulp-svgstore": "8.0.0",
+    "gulp-svgstore": "9.0.0",
     "html-minifier": "4.0.0",
     "lodash.get": "4.4.2",
     "markdown-it-anchor": "8.4.1",