fix(RTC) Add AV1 to CodecMimeType unit test

service/RTC/CodecMimeType.spec.ts

+import exp from "constants";
 import * as exported from "./CodecMimeType";
 
 // this test is brittle on purpose because it's designed to ensure that the TypeScript conversion maintains backward compatibility
 
 describe( "/service/RTC/CodecMimeType members", () => {
     const {
+        AV1,
         H264,
         OPUS,
         ULPFEC,
     } = exported as any; // TODO: remove cast after typescript conversion
 
     it( "known members", () => {
+        expect( AV1 ).toBe( 'av1' );
         expect( H264 ).toBe( 'h264' );
         expect( OPUS ).toBe( 'opus' );
         expect( ULPFEC ).toBe( 'ulpfec' );
         expect( VP8 ).toBe( 'vp8' );
         expect( VP9 ).toBe( 'vp9' );
         if ( CodecMimeType ) {
+            expect( CodecMimeType.AV1 ).toBe( 'av1' );
             expect( CodecMimeType.H264 ).toBe( 'h264' );
             expect( CodecMimeType.OPUS ).toBe( 'opus' );
             expect( CodecMimeType.ULPFEC ).toBe( 'ulpfec' );