LAKITU: python-utils-r1: default to python 3.8

BUG=b/257113269
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I64e6c48e796ba049b6e03fbd5f905fa211797324
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/eclass-overlay/+/42399
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
index 7069100..8dc6d85 100644
--- a/eclass/python-utils-r1.eclass
+++ b/eclass/python-utils-r1.eclass
@@ -41,7 +41,7 @@
 _PYTHON_ALL_IMPLS=(
 	pypy3
 	python2_7
-	python3_7 python3_8 python3_9 python3_6
+	python3_6 python3_7 python3_9 python3_8
 )
 readonly _PYTHON_ALL_IMPLS