.zuul: Try to prevent the CI from timing out on Fedora

With the recent expansion of the test suite, it's necessary to increase
the timeout for all Fedora nodes to prevent the CI from timing out.

https://github.com/containers/toolbox/pull/1387

.zuul.yaml

@@ -51,7 +51,7 @@
 - job:
     name: system-test-fedora-rawhide
     description: Run Toolbox's system tests in Fedora Rawhide
-    timeout: 3600
+    timeout: 4800
     nodeset:
       nodes:
         - name: fedora-rawhide
@@ -62,7 +62,7 @@
 - job:
     name: system-test-fedora-39
     description: Run Toolbx's system tests in Fedora 39
-    timeout: 2400
+    timeout: 3000
     nodeset:
       nodes:
         - name: fedora-39
@@ -73,7 +73,7 @@
 - job:
     name: system-test-fedora-38
     description: Run Toolbx's system tests in Fedora 38
-    timeout: 2400
+    timeout: 3000
     nodeset:
       nodes:
         - name: fedora-38
@@ -84,7 +84,7 @@
 - job:
     name: system-test-fedora-37
     description: Run Toolbx's system tests in Fedora 37
-    timeout: 2400
+    timeout: 3000
     nodeset:
       nodes:
         - name: fedora-37