bump: go version from 1.16 to 1.17.6 (#610)

internal_setup.bzl

diff --git a/internal_setup.bzl b/internal_setup.bzl
index 63385c9..bcae1f1 100644
--- a/internal_setup.bzl
+++ b/internal_setup.bzl
@@ -21,6 +21,6 @@
 
     go_rules_dependencies()
 
-    go_register_toolchains(version = "1.16")
+    go_register_toolchains(version = "1.17.6")
 
     gazelle_dependencies()