BP_DOTNET_FRAMEWORK_VERSION should support wildcard patterns

[arjun024]

Problem

Try building an app with BP_DOTNET_FRAMEWORK_VERSION with 7.0.x,7.x.x, or or 7.*.*, or 7.*.

Build fails with Invalid Semantic Version.

Users are forced to enter the exact available version in the buildpack. e.g. BP_DOTNET_FRAMEWORK_VERSION=7.0.10

Expectation

Users expect the wildcards to work, and cannot be expected to change their env var values with every patch/minor update of the buildpack. See patterns supported in other types of buildpacks like CF buildpacks (link)