fix(deps): require uritemplate 3.0.1 (#1629)

* fix(deps): require uritemplate 3.0.1

* revert testing/constraints-3.10.txt
diff --git a/testing/constraints-3.6.txt b/testing/constraints-3.6.txt
index 0c0e7a2..35fb574 100644
--- a/testing/constraints-3.6.txt
+++ b/testing/constraints-3.6.txt
@@ -9,4 +9,4 @@
 google-auth==1.16.0
 google-auth-httplib2==0.0.3
 google-api-core==1.21.0
-uritemplate==3.0.0
\ No newline at end of file
+uritemplate==3.0.1
\ No newline at end of file