Backport bump compat for "SpecialFunctions" to "1.0" to 0.6 (#389)

* CompatHelper: bump compat for "SpecialFunctions" to "1.0" (#388)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
(cherry picked from commit 478c572)

* Bump version to 0.6.9

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: martinholters

Project.toml

@@ -1,6 +1,6 @@
 name = "DSP"
 uuid = "717857b8-e6f2-59f4-9121-6e50c889abd2"
-version = "0.6.8"
+version = "0.6.9"
 
 [deps]
 FFTW = "7a1cc6ca-52ef-59f5-83cd-3a7055c09341"
@@ -18,7 +18,7 @@ IterTools = "1"
 OffsetArrays = "0.11, 1"
 Polynomials = "1.0"
 Reexport = "0.2"
-SpecialFunctions = "0.8, 0.9, 0.10"
+SpecialFunctions = "0.8, 0.9, 0.10, 1.0"
 julia = "1"
 
 [extras]