Add undeclared body-parser dependency

We explicitly use this in server.ts. It has always been available
because it is a dependency of express, and therefore a transitive
dependency of ours. Because we are using it directly in *our* code
we should declare the dependency.

I am using version ^1.20.3 because that is the one used by the
version of Express we are using.

Author: alanorth

package-lock.json

@@ -114,6 +114,7 @@
     "@terraformer/wkt": "^2.2.1",
     "altcha": "^0.9.0",
     "angulartics2": "^12.2.0",
+    "body-parser": "^1.20.3",
     "bootstrap": "^5.3",
     "cerialize": "0.1.18",
     "cli-progress": "^3.12.0",