sig-instrumentation: Update my company association

Author: brancz

sig-instrumentation/README.md

@@ -30,7 +30,7 @@ The Chairs of the SIG run operations and processes governing the SIG.
 The Technical Leads of the SIG establish new subprojects, decommission existing
 subprojects, and resolve cross-subproject technical issues and decisions.
 
-* Frederic Branczyk (**[@brancz](https://github.com/brancz)**), Red Hat
+* Frederic Branczyk (**[@brancz](https://github.com/brancz)**), Polar Signals
 * David Ashpole (**[@dashpole](https://github.com/dashpole)**), Google
 
 ## Emeritus Leads

sigs.yaml

@@ -1416,7 +1416,7 @@ sigs:
     tech_leads:
     - github: brancz
       name: Frederic Branczyk
-      company: Red Hat
+      company: Polar Signals
     - github: dashpole
       name: David Ashpole
       company: Google