CompatHelper: bump compat for AbstractMCMC to 5 for package ComradeDynesty, (keep existing compat) #48

Job	Run time
Julia nightly - Core - ubuntu-latest	23m 59s
Julia nightly - ComradeAdaptMCMC - ubuntu-latest	47m 1s
Julia nightly - ComradeAHMC - ubuntu-latest	19m 50s
Julia nightly - ComradeDynesty - ubuntu-latest	39m 24s
Julia nightly - ComradeOptimization - ubuntu-latest	36m 12s
Julia nightly - ComradeNested - ubuntu-latest	38m 20s
	3h 24m 46s

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