chore(bazel): update gapic-generator-php v1.4.3

Google APIs · copybara-github · commit 5d7f6a21bd6b · 2022-02-04T06:46:11.000-08:00
Changes include:
- backwards-compat field_behavior patches for Firestore

PiperOrigin-RevId: 426390959
diff --git a/WORKSPACE b/WORKSPACE
@@ -296,7 +296,7 @@ yarn_install(
 ##############################################################################
 
 # PHP micro-generator
-_gapic_generator_php_version = "1.4.2"
+_gapic_generator_php_version = "1.4.3"
 
 http_archive(
     name = "gapic_generator_php",
