tf-a-lts2.8-main: Switch node to docker-amd64-tf-a-lts2.8-jammy

As requested in https://linaro.atlassian.net/browse/TFC-450

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ic0ad44dd4613ab3d2a15111e370583ef18ed4d95
diff --git a/tf-a-lts2.8-main.yaml b/tf-a-lts2.8-main.yaml
index 782392b..1313ad9 100644
--- a/tf-a-lts2.8-main.yaml
+++ b/tf-a-lts2.8-main.yaml
@@ -1,6 +1,6 @@
 - job:
     name: tf-a-lts2.8-main
-    node: docker-amd64-tf-a-jammy
+    node: docker-amd64-tf-a-lts2.8-jammy
     project-type: multijob
     concurrent: true
     disabled: false