Version update to 7.2.0

[KyleMcMaster]

• Bumps version to 7.2.0 to kick off new release of all 3 packages

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
Ardalis.Result.AspNetCore	54%	60%	159	➖
Ardalis.Result.Sample.Core	38%	38%	63	❌
Ardalis.Result.FluentValidation	0%	0%	6	❌
Ardalis.Result	26%	0%	82	❌
Ardalis.Result.SampleWeb	66%	50%	43	➖
Summary	46% (436 / 945)	49% (96 / 194)	353	❌