fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-PRISMJS-2404333

package-lock.json

@@ -19,7 +19,7 @@
         "mathjax-node": "^2.1.1",
         "ncp": "^2.0.0",
         "node-prismjs": "^0.1.0",
-        "prismjs": "^1.29.0",
+        "prismjs": "^1.27.0",
         "redis": "^3.0.2",
         "rss": "^1.2.2",
         "showdown": "^1.9.1"
@@ -6694,9 +6694,9 @@
       }
     },
     "node_modules/prismjs": {
-      "version": "1.29.0",
-      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.29.0.tgz",
-      "integrity": "sha512-Kx/1w86q/epKcmte75LNrEoT+lX8pBpavuAbvJWRXar7Hz8jrtF+e3vY751p0R8H9HdArwaCTNDDzHg/ScJK1Q==",
+      "version": "1.27.0",
+      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.27.0.tgz",
+      "integrity": "sha512-t13BGPUlFDR7wRB5kQDG4jjl7XeuH6jbJGt11JHPL96qwsEHNX2+68tFXqc1/k+/jALsbSWJKUOT/hcYAZ5LkA==",
       "engines": {
         "node": ">=6"
       }
@@ -14079,9 +14079,9 @@
       }
     },
     "prismjs": {
-      "version": "1.29.0",
-      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.29.0.tgz",
-      "integrity": "sha512-Kx/1w86q/epKcmte75LNrEoT+lX8pBpavuAbvJWRXar7Hz8jrtF+e3vY751p0R8H9HdArwaCTNDDzHg/ScJK1Q=="
+      "version": "1.27.0",
+      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.27.0.tgz",
+      "integrity": "sha512-t13BGPUlFDR7wRB5kQDG4jjl7XeuH6jbJGt11JHPL96qwsEHNX2+68tFXqc1/k+/jALsbSWJKUOT/hcYAZ5LkA=="
     },
     "process-nextick-args": {
       "version": "2.0.1",

package.json

@@ -13,7 +13,7 @@
     "mathjax-node": "^2.1.1",
     "ncp": "^2.0.0",
     "node-prismjs": "^0.1.0",
-    "prismjs": "^1.29.0",
+    "prismjs": "^1.27.0",
     "redis": "^3.0.2",
     "rss": "^1.2.2",
     "showdown": "^1.9.1"