Update codeowners (Azure#25152)

Author: billwert

.github/CODEOWNERS

@@ -40,7 +40,7 @@
 /sdk/containerregistry/                             @pallavit @alzimmermsft
 
 # PRLabel: %Azure.Core
-/sdk/core/                                          @alzimmermsft @srnagar @anuchandy @lmolkova @pallavit @vcolin7 @mssfang @jonathangiles
+/sdk/core/                                          @alzimmermsft @srnagar @anuchandy @lmolkova @pallavit @vcolin7 @mssfang @jonathangiles @billwert
 
 # PRLabel: %Azure.Core.AMQP
 /sdk/core/azure-core-amqp/                          @conniey @anuchandy @ki1729 @srnagar @jonathangiles
@@ -83,7 +83,7 @@
 /sdk/metricsadvisor/                                @samvaity @anuchandy
 
 # PRLabel: %Azure.Identity
-/sdk/identity/                                      @g2vinay @schaabs @joshfree
+/sdk/identity/                                      @g2vinay @schaabs @joshfree @billwert
 
 # PRLabel: %KeyVault
 /sdk/keyvault/                                      @vcolin7 @g2vinay @samvaity