chore: add dep review override for csv gem

Author: tobybellwood

.github/dependency-review-config.yaml

@@ -15,3 +15,6 @@ allow-dependencies-licenses:
 # ostruct is available as open source under the terms of the 2-Clause BSD License.
 # https://github.com/ruby/ostruct?tab=License-1-ov-file
 - pkg:gem/ostruct
+# csv is available as open source under the terms of the 2-Clause BSD License.
+# https://github.com/ruby/csv?tab=BSD-2-Clause-1-ov-file#readme
+- pkg:gem/csv