A forgotten update of the Fedora 38 image

...which, among other things, apparently solved a regression in STL. The
CI has been running with this for a long time, but it wasn't present in
our Ansible config. My bad, oops.

Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109703
Change-Id: Id4a6102614bb9fe5e1207f6b6b09d781f202a7cc
diff --git a/files/nodepool/nodepool.yaml b/files/nodepool/nodepool.yaml
index 6fe598e..dc6142d 100644
--- a/files/nodepool/nodepool.yaml
+++ b/files/nodepool/nodepool.yaml
@@ -26,7 +26,7 @@
     boot-timeout: 180
     cloud-images:
       - name: f38
-        image-name: ci-zuul-f38--2023-05-05--00
+        image-name: ci-zuul-f38--2023-05-18--01
         username: ci
     pools:
       - name: meta-big