internal: use new git name

Kokoro git name has changed (b/140485874).

Change-Id: I887815139612b8fa52caa0f12abf957226b8ea22
Reviewed-on: https://code-review.googlesource.com/c/google-api-go-client/+/44850
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/internal/kokoro/test.sh b/internal/kokoro/test.sh
index 7968397..37a5102 100755
--- a/internal/kokoro/test.sh
+++ b/internal/kokoro/test.sh
@@ -9,7 +9,7 @@
 set -x
 
 # cd to project dir on Kokoro instance
-cd git/google-api-go-client
+cd git/google_api
 
 go version