build: update sync config

Updates the Github sync config to account for the M3 theme.

Author: crisbeto

.ng-dev/google-sync-config.json

@@ -6,6 +6,7 @@
     "src/material/**/*.ts",
     "src/material/**/*.html",
     "src/material/**/*.scss",
+    "src/material/schematics/ng-generate/m3-theme/**/*",
     "src/material-experimental/**/*.ts",
     "src/material-experimental/**/*.html",
     "src/material-experimental/**/*.scss",
@@ -24,6 +25,7 @@
     "src/**/*spec.ts",
     "src/cdk/schematics/**/*",
     "src/material/schematics/**/*",
+    "src/material/schematics/ng-generate/m3-theme/**/*.bazel",
     "src/google-maps/schematics/**/*",
     "src/cdk/testing/testbed/zone-types.d.ts",
     "src/material/_theming.scss",