CompatHelper: bump compat for "SpecialFunctions" to "2" (#752)

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Author: github-actions[bot]

Project.toml

@@ -31,7 +31,7 @@ FFTW = "1"
 FastTransforms = "0.13"
 RecipesBase = "1.0"
 Reexport = "1.0"
-SpecialFunctions = "1.1"
+SpecialFunctions = "1.1, 2"
 julia = "1.6"
 
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