chore: upgrade highlight.js to 9.15.9

Signed-off-by: BoHong Li <raccoon@hackmd.io>

Author: a60814billy

package.json

@@ -65,7 +65,7 @@
     "graceful-fs": "~4.2.1",
     "handlebars": "~4.1.2",
     "helmet": "~3.20.0",
-    "highlight.js": "~9.12.0",
+    "highlight.js": "~9.15.9",
     "i18n": "~0.8.3",
     "ionicons": "~2.0.1",
     "isomorphic-fetch": "~2.2.1",

yarn.lock

@@ -6399,16 +6399,11 @@ highlight.js@^9.1.0:
   resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-9.15.6.tgz#72d4d8d779ec066af9a17cb14360c3def0aa57c4"
   integrity sha512-zozTAWM1D6sozHo8kqhfYgsac+B+q0PmsjXeyDrYIHHcBN0zTVT66+s2GW1GZv7DbyaROdLXKdabwS/WqPyIdQ==
 
-highlight.js@^9.15.5:
+highlight.js@^9.15.5, highlight.js@~9.15.9:
   version "9.15.9"
   resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-9.15.9.tgz#865257da1dbb4a58c4552d46c4b3854f77f0e6d5"
   integrity sha512-M0zZvfLr5p0keDMCAhNBp03XJbKBxUx5AfyfufMdFMEP4N/Xj6dh0IqC75ys7BAzceR34NgcvXjupRVaHBPPVQ==
 
-highlight.js@~9.12.0:
-  version "9.12.0"
-  resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-9.12.0.tgz#e6d9dbe57cbefe60751f02af336195870c90c01e"
-  integrity sha1-5tnb5Xy+/mB1HwKvM2GVhwyQwB4=
-
 hmac-drbg@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"