[CI] Update default.xml. Changed: seL4

Author: seL4-ci

default.xml

@@ -13,5 +13,5 @@
   <project name="isabelle" revision="refs/tags/Isabelle2024" dest-branch="ts-2024"/>
   <project name="l4v" revision="911b2147498fec3d0f8c912a2aff6cfc0503d024" dest-branch="master"/>
   <project name="polyml" path="HOL4/polyml" revision="bf2020d077bfbb1c5911dcef20bd275c95da7162" dest-branch="successful-decompile"/>
-  <project name="seL4" revision="dfd0853c5d589ddfb0bafb3871929be47aeed58b"/>
+  <project name="seL4" revision="974e9ffb2ee6bd3e45b72f27d92ccac06ad477d5"/>
 </manifest>