chore(bazel): update gapic-generator-php to v1.4.5

Google APIs · copybara-github · commit 6481719e9b6c · 2022-02-18T09:31:55.000-08:00
Changes include:
- backwards compat patch for Spanner v1 CreateSession

PiperOrigin-RevId: 429584109
diff --git a/WORKSPACE b/WORKSPACE
@@ -296,7 +296,7 @@ yarn_install(
 ##############################################################################
 
 # PHP micro-generator
-_gapic_generator_php_version = "1.4.4"
+_gapic_generator_php_version = "1.4.5"
 
 http_archive(
     name = "gapic_generator_php",
