templates/packer: switch to fedora-40

Fedora 38 is EOL, and packit no longer builds rpms for it.

The current python3.12 + ansible 2.12 combination which is the default
on fedora 40 doesn't work, so switch to python3.9.

tools/appsre-build-fedora-worker-packer.sh

@@ -8,7 +8,7 @@ export BUILD_RPMS=false
 # Fedora community workers use osbuild form rpmrepo + composer from
 # copr, as the osbuild rpms from copr disappear too quickly.
 export ANSIBLE_TAGS="fedora"
-FEDORA=fedora-38
+FEDORA=fedora-40
 export PACKER_ONLY_EXCEPT=--only=amazon-ebs."$FEDORA"-x86_64,amazon-ebs."$FEDORA"-aarch64
 COMMIT_SHA="${COMMIT_SHA:-$(git rev-parse HEAD)}"
 

tools/appsre-build-worker-packer.sh

@@ -70,6 +70,12 @@ EOF
         if [[ $osbuild_commit != "null" ]]; then
             tee -a "$item/group_vars/all.yml" <<EOF
 osbuild_commit: $osbuild_commit
+EOF
+        fi
+
+        if [[ "$item" == templates/packer/ansible/inventory/fedora* ]]; then
+            tee -a "$item/group_vars/all.yml" <<EOF
+ansible_python_interpreter: /usr/bin/python3.9
 EOF
         fi