CompatHelper: bump compat for IntervalArithmetic to 0.20, (keep existing compat) (#2890)

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>

Author: github-actions[bot]

Project.toml

@@ -28,7 +28,7 @@ ExprTools = "0.1"
 GLPK = "0.11, 0.12, 0.13, 0.14, 0.15"
 GLPKMathProgInterface = "0.4, 0.5"
 GR = "0"
-IntervalArithmetic = "0.15, 0.16, 0.17, 0.18, 0.19"
+IntervalArithmetic = "0.15, 0.16, 0.17, 0.18, 0.19, 0.20"
 IntervalConstraintProgramming = "0.9, 0.10, 0.11, 0.12"
 IntervalMatrices = "0.8"
 Javis = "0.5"