bump: go version to 1.17.3 (#65)

diff --git a/WORKSPACE b/WORKSPACE
index 35f13c2..aae3047 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -68,7 +68,7 @@
 
 go_embed_data_dependencies()
 
-go_register_toolchains(version = "1.17.1")
+go_register_toolchains(version = "1.17.3")
 
 gazelle_dependencies()