[macOS SDK] Update macOS minimum version to 10.15

[spetrescu84]

Proposed changes

Update macOS minimum version to 10.15

Type of change

• [x] Feature work
• [ ] Bug fix
• [ ] Documentation
• [ ] Engineering change
• [ ] Test
• [ ] Logging/Telemetry

Risk

• [ ] High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
• [ ] Medium – Errors could cause regression of 1 or more scenarios. (Example: somewhat complex bug fixes, small new features)
• [x] Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)

Additional information

[nilo-ms]

@spetrescu84 I noticed that in the MSAL project we have many places where we check the macOS version" "if (@available(macOS 10.15, *))". Can you please remove these checks given than now they're not needed anymore?

[spetrescu84]

@spetrescu84 I noticed that in the MSAL project we have many places where we check the macOS version" "if (@available(macOS 10.15, *))". Can you please remove these checks given than now they're not needed anymore?

Removed all instances of if (@available(macOS 10.15, *)) from MSAL Project. Any that are left should be part of IdentityCore project (not all MSID files are) and will removed as part of the IdentityCore PR

[Veena11]

Let's merge this PR only after the July release is out

+1