Update dependency @types/express to v4.17.6

Author: renovate-bot

package.json

@@ -23,7 +23,7 @@
     "@sourcegraph/prettierrc": "^3.0.3",
     "@sourcegraph/tsconfig": "^4.0.1",
     "@sourcegraph/tslint-config": "^13.4.0",
-    "@types/express": "4.17.4",
+    "@types/express": "4.17.6",
     "@types/got": "9.6.10",
     "@types/highlight.js": "9.12.3",
     "@types/ini": "1.3.30",

yarn.lock

@@ -952,10 +952,10 @@
     "@types/node" "*"
     "@types/range-parser" "*"
 
-"@types/[email protected].4":
-  version "4.17.4"
-  resolved "https://registry.npmjs.org/@types/express/-/express-4.17.4.tgz#e78bf09f3f530889575f4da8a94cd45384520aac"
-  integrity sha512-DO1L53rGqIDUEvOjJKmbMEQ5Z+BM2cIEPy/eV3En+s166Gz+FeuzRerxcab757u/U4v4XF4RYrZPmqKa+aY/2w==
+"@types/[email protected].6":
+  version "4.17.6"
+  resolved "https://registry.npmjs.org/@types/express/-/express-4.17.6.tgz#6bce49e49570507b86ea1b07b806f04697fac45e"
+  integrity sha512-n/mr9tZI83kd4azlPG5y997C/M4DNABK9yErhFM6hKdym4kkmd9j0vtsJyjFIwfRBxtrxZtAfGZCNRIBMFLK5w==
   dependencies:
     "@types/body-parser" "*"
     "@types/express-serve-static-core" "*"