update WG Lead for PSWG (#1690)

Signed-off-by: Daniel Hawton <[email protected]>

Author: dhawton

WORKING-GROUPS.md

@@ -63,13 +63,13 @@ Each working group has one or more leads which coordinate the activities of the
 -------------------------------------------------------------------------------------|----------------------------------------------------|------------|-------
                                                                                 | [Rama Chavali](https://github.com/ramaraochavali)  | Salesforce | Networking - Control Plane
 <img width="30px" src="https://avatars3.githubusercontent.com/u/821270?s=80&v=4">    | [Mitch Connors](https://github.com/therealmitchconnors) | Microsoft   | User Experience
+<img width="30px" src="https://avatars.githubusercontent.com/u/1330566?v=4">         | [Daniel Hawton](https://github.com/dhawton)        | Solo.io    | Product Security
 &nbsp;                                                                               | [Jianpeng He](https://github.com/zirain)           | Tetrate    | Extensions and Telemetry
 <img width="30px" src="https://avatars1.githubusercontent.com/u/623453?s=400&v=4">   | [John Howard](https://github.com/howardjohn)       | Solo.io    | Networking
 &nbsp;                                                                               | [Steven Landow](https://github.com/stevenctl)      | Solo.io    | Networking - Control Plane
 <img width="30px" src="https://avatars.githubusercontent.com/u/64559656?v=4">        | [Jackie Maertens (Elliot)](https://github.com/jaellio)        | Microsoft  | Product Security
 &nbsp;                                                                               | [Costin Manolache](https://github.com/costinm)     | Google     | Environments
 &nbsp;                                                                               | [Sam Naser](https://github.com/monkeyanator)       | Aviatrix   | Environments
-&nbsp;                                                                               | [Justin Pettit](https://github.com/justinpettit)   | Google     | Product Security
 <img width="30px" src="https://avatars3.githubusercontent.com/u/3237651?s=400&v=4">  | [Ed Snible](https://github.com/esnible)            | IBM        | User Experience
 &nbsp;                                                                               | [Lei Tang](https://github.com/lei-tang)            | Google     | Security, Extensions and Telemetry
 <img width="30px" src="https://avatars1.githubusercontent.com/u/10537847?s=400&v=4"> | [Eric Van Norman](https://github.com/ericvn)       | IBM        | Test and Release