meta: add mailmap entry for aditi-1400

meta: add mailmap entry for aditi-1400 · nodejs/node@0eb5962

Original file line number	Diff line number	Diff line change
`@@ -6,6 +6,7 @@ Abdirahim Musse <abdirahim.musse@ibm.com> <33973272+abmusse@users.noreply.github`
`6`	`6`	`Abe Fettig <abefettig@gmail.com> <abe@fettig.net>`
`7`	`7`	`Abhimanyu Vashisht <abhimanyuvashisht.av@gmail.com>`
`8`	`8`	`Adam Langley <agl@imperialviolet.org> <agl@google.com>`
	`9`	`+Aditi Singh <aditisingh1400@gmail.com>`
`9`	`10`	`Akhil Marsonya <akhil.marsonya27@gmail.com>`
`10`	`11`	`Akhil Marsonya <akhil.marsonya27@gmail.com> <16393876+marsonya@users.noreply.github.com>`
`11`	`12`	`Akito Ito <akito0107@gmail.com> <akito_ito@r.recruit.co.jp>`