Fix license being valid SPDX syntax

Author: wcampbell0x2a

Cargo.toml

@@ -3,7 +3,7 @@ name = "heretek"
 version = "0.5.0"
 edition = "2021"
 description = "GDB TUI Dashboard for the understanding of vast knowledge"
-license = "MIT/Apache-2.0"
+license = "MIT OR Apache-2.0"
 repository = "https://github.com/wcampbell0x2a/heretek"
 categories = ["development-tools"]
 keywords = ["gdb", "tui", "debugging", "embedded", "gdbserver"]