Adding IQ3_XSS and fixed medium models

mixtral-instruct-8x7b-iq3-xxs.gguf

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+version https://git-lfs.github.com/spec/v1
+oid sha256:05e53fa7a1b4b9393ecaea199da5ad1edc7772f5c34ecc3faaead57bdd704adf
+size 18309714176

mixtral-instruct-8x7b-q3k-medium.gguf

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:143a3e83a636cf9a21a0794fc142ded3e3acb68628457c54ee0a63a3f69c43bb
-size 22375461120
+oid sha256:327a5c61cf1c6f3245e7ba3800b24457b1e4b3a785236e6be8cc32318ba0430e
+size 22545330432

mixtral-instruct-8x7b-q4k-medium.gguf

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:68ffe5aac9826194336b71377f872f3377f965ae9fed5b785a2714b4d3dae146
-size 28449444096
+oid sha256:89cfc3c0f6670319b01ff116e3a57807ffbd1b8371ddf45afdfedf42972d10e7
+size 28447346944