Update citation

Author: boriskaus

CITATION.bib

@@ -2,12 +2,13 @@ @software{petsc_jl
   author       = {Kaus, Boris and
                   Shah, Viral B. and
                   Kozdon, Jeremy E. and
-                  Churavy, Valentin and
+                  Churavy, Valentin and 
+                  Ranocha, Hendrik and
                   Schnetter, Erik and
                   Byrne, Simon},
   title        = {PETSc.jl: Julia bindings for PETSc},
   year         = 2026,
   publisher    = {Zenodo},
   doi          = {10.5281/zenodo.18274810},
   url          = {https://github.com/JuliaParallel/PETSc.jl}
-}
+}