[CI] Swift host compiler version updated (6.2.4)

The Linux container utilized in Swift CI (ci.swift.org) has been updated to include 6.2.4. ┌────────────────────────────────┬─────────────────────────┐ │ Platform │ Swift Version │ ├────────────────────────────────┼─────────────────────────┤ │ debian/12 │ 6.2.4 │ ├────────────────────────────────┼─────────────────────────┤ │ debian/13 │ 6.3 │ ├─────────────────────────...