chore: bump MCPP_VERSION constant to 0.0.105

mcpp.toml and src/toolchain/fingerprint.cppm are two independent version
sources; bumping only the manifest left `mcpp --version` reporting the
old number, which 01_help_and_version.sh cross-checks against mcpp.toml.

Author: Sunrisepeak

src/toolchain/fingerprint.cppm

@@ -18,7 +18,7 @@ import mcpp.toolchain.detect;
 
 export namespace mcpp::toolchain {
 
-inline constexpr std::string_view MCPP_VERSION = "0.0.104";
+inline constexpr std::string_view MCPP_VERSION = "0.0.105";
 
 struct FingerprintInputs {
     Toolchain                       toolchain;