Adds Armor-Piercing 9mm Magazines to the game (#20815)

-Adds Armor Piercing 9mm Ammo along with Pistol Magazines for it.

-It currently deals 12 damage and has 30 Armor-Penetration, allowing it
to deal more damage than .45 to armored opponents however it struggles
against unarmoured targets due to it's low damage output

Only available on the Antagonist Uplinks for now.


![9mmap2](https://github.com/user-attachments/assets/81b9f758-8e8e-4f0b-ad8a-b399c5fabd60)

---------

Signed-off-by: Birigilis <kavbest10@gmail.com>
Signed-off-by: Matt Atlas <mattiathebest2000@hotmail.it>
Co-authored-by: Matt Atlas <mattiathebest2000@hotmail.it>
Co-authored-by: SleepyGemmy <99297919+SleepyGemmy@users.noreply.github.com>

code/datums/uplink/ammunition.dm

@@ -8,7 +8,12 @@
 /datum/uplink_item/item/ammo/mc9mm
 	name = "9mm Magazine"
 	path = /obj/item/ammo_magazine/mc9mm
-	desc = "Contains ten rounds of 9mm bullets."
+	desc = "Contains twelve rounds of 9mm bullets."
+
+/datum/uplink_item/item/ammo/mc9mm/polymer
+	name = "AP 9mm Magazine"
+	path = /obj/item/ammo_magazine/mc9mm/polymer
+	desc = "Contains twelve rounds of armor-piercing 9mm bullets."
 
 /datum/uplink_item/item/ammo/darts
 	name = "Chemical Darts"
@@ -18,7 +23,7 @@
 /datum/uplink_item/item/ammo/fourty_five
 	name = ".45 Pistol Magazine"
 	path = /obj/item/ammo_magazine/c45m
-	desc = "Contains seven rounds of .45 bullets."
+	desc = "Contains nine rounds of .45 bullets."
 
 /datum/uplink_item/item/ammo/submachinegundrum
 	name = "Submachine Gun Drum Magazine (.45)"