Update SSMProblems compat entry

Author: THargreaves

GeneralisedFilters/Project.toml

@@ -1,7 +1,7 @@
 name = "GeneralisedFilters"
 uuid = "3ef92589-7ab8-43f9-b5b9-a3a0c86ecbb7"
 authors = ["THargreaves <th542@cam.ac.uk>"]
-version = "0.3.0"
+version = "0.3.1"
 
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"
@@ -31,7 +31,7 @@ LogExpFunctions = "0.3"
 NNlib = "0.9"
 OffsetArrays = "1.14.1"
 PDMats = "0.11.35"
-SSMProblems = "0.5"
+SSMProblems = "0.6"
 StaticArrays = "1.9.14"
 Statistics = "1.11.1"
 StatsBase = "0.34.3"