Windows: Explicitly list versions with upper bound - #473

Follow on from #455.

I definitely found the change in that PR helped for the last releases: different wording like "(only up to 3.15)" is clearer than "(3.15 and earlier)", when we also have options like "(3.15 and later)".

I suggested somewhere about explicitly listing the versions, but we can't replace those like "(3.15 and later)" with "(3.15, 3.16)" because we'd have to remember to add 3.17 and so on.

But we can replace those like "(only up to 3.15)" with "(3.14, 3.15)" because it's a finite set, and it doesn't matter if we forget to remove 3.14 when it's no longer relevant.

Before:

• Separate free-threaded outputs (3.15 and later)
• Build with tail-calling support (3.15 and later)
• Produce EXE/MSI installer (only up to 3.15)

After:

• Separate free-threaded outputs (3.15 and later)
• Build with tail-calling support (3.15 and later)
• Produce EXE/MSI installer (3.14, 3.15)