Update CITATION.cff

CITATION.cff

@@ -499,6 +499,30 @@ references:
   - family-names: Girlich
     given-names: Maximilian
   year: '2024'
+- type: software
+  title: withr
+  abstract: 'withr: Run Code ''With'' Temporarily Modified Global State'
+  notes: Suggests
+  url: https://withr.r-lib.org
+  repository: https://CRAN.R-project.org/package=withr
+  authors:
+  - family-names: Hester
+    given-names: Jim
+  - family-names: Henry
+    given-names: Lionel
+    email: lionel@posit.co
+  - family-names: Müller
+    given-names: Kirill
+    email: krlmlr+r@mailbox.org
+  - family-names: Ushey
+    given-names: Kevin
+    email: kevinushey@gmail.com
+  - family-names: Wickham
+    given-names: Hadley
+    email: hadley@posit.co
+  - family-names: Chang
+    given-names: Winston
+  year: '2024'
 - type: software
   title: BH
   abstract: 'BH: Boost C++ Header Files'