Add shy-latn and szy

Shawiya/Tacawit and Sakizaya. Both have wikiprojects that are live, and their
omission from language-data makes it impossible to find them with the ULS.

data/langdb.yaml

@@ -504,6 +504,7 @@ languages:
   shi-tfng: [Tfng, [AF], ⵜⴰⵛⵍⵃⵉⵜ]
   shi: [shi-latn]
   shn: [Mymr, [AS], လိၵ်ႈတႆး]
+  shy-latn: [Latn, [AF], tacawit]
   si: [Sinh, [AS], සිංහල]
   simple: [en-simple]
   sjd: [Cyrl, [EU], Кӣллт са̄мь кӣлл]
@@ -543,6 +544,7 @@ languages:
   swb: [Latn, [AF], Shikomoro]
   sxu: [Latn, [EU], Säggssch]
   szl: [Latn, [EU], ślůnski]
+  szy: [Latn, [AS], Sakizaya]
   ta: [Taml, [AS], தமிழ்]
   tay: [Latn, [AS], Tayal]
   tcy: [Knda, [AS], ತುಳು]