Add IVF and Y4M LFS patterns

Author: JimBobSquarePants

.gitattributes

@@ -140,6 +140,8 @@
 *.avif              filter=lfs diff=lfs merge=lfs -text
 *.hvc1              filter=lfs diff=lfs merge=lfs -text
 *.hvcc              filter=lfs diff=lfs merge=lfs -text
+*.ivf               filter=lfs diff=lfs merge=lfs -text
+*.y4m               filter=lfs diff=lfs merge=lfs -text
 *.yuv               filter=lfs diff=lfs merge=lfs -text
 *.bit               filter=lfs diff=lfs merge=lfs -text
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