Update the PG CodeMirror Editor.

Updated packages have been published, and this just updates the
package.json file to point to the latest version.

The dependencies of the `pg-codemirror-editor` and `codemirror-lang-pg`
packages were updated (largely to deal with security vulnerabilities in
the dependencies).

There is also a bug fixed with builtin operator names occuring as the
key of a hash. For example, the keys of the following hash are builtin
operators, but should not be interpreted as such in this context.

```perl
%hash = (
    step    => 1,
    defined => 1,
    split   => 1
);
```

Since they were the hask key value pair was not parsing, and so all
syntax highlighting after it is messed up.

The first key `step` is a PG operator, the second `defined` is a Perl
named unary operator, the third `split` is a Perl list operator.  Of
course any of the other PG operators, Perl named unary operators, or
Perl list operators had the same problem since they are all handled in
the code by the same external tokenizer.

Author: drgrice1