packit: Drop Fedora 38

We traditionally support two Fedora releases at any time. Fedora 40 was
already added earlier.

packit.yaml

@@ -19,7 +19,6 @@ jobs:
   - job: copr_build
     trigger: pull_request
     targets:
-    - fedora-38
     - fedora-39
     - fedora-40
     - fedora-latest-aarch64
@@ -31,7 +30,6 @@ jobs:
   - job: tests
     trigger: pull_request
     targets:
-      - fedora-38
       - fedora-39
       - fedora-40
       - fedora-latest-aarch64
@@ -64,22 +62,19 @@ jobs:
     trigger: release
     dist_git_branches:
       - fedora-development
-      - fedora-38
       - fedora-39
       - fedora-40
 
   - job: koji_build
     trigger: commit
     dist_git_branches:
       - fedora-development
-      - fedora-38
       - fedora-39
       - fedora-40
 
   - job: bodhi_update
     trigger: commit
     dist_git_branches:
       # rawhide updates are created automatically
-      - fedora-38
       - fedora-39
       - fedora-40