chore(bazel): update gapic-generator-php v1.6.7

Google APIs · copybara-github · commit b0251f4737cb · 2023-03-08T14:54:12.000-08:00
PiperOrigin-RevId: 515149688
diff --git a/WORKSPACE b/WORKSPACE
@@ -392,7 +392,7 @@ pnpm_repository(name = "pnpm")
 ##############################################################################
 
 # PHP micro-generator
-_gapic_generator_php_version = "1.6.6"
+_gapic_generator_php_version = "1.6.7"
 
 http_archive(
     name = "gapic_generator_php",
