devel/xtensa-esp-elf: Fix toolchain version string
xtensa-esp32-elf-cc was reporting:
xtensa-esp-elf-cc (crosstool-NG UNKNOWN) 13.2.0
Update to correctly show the version of crosstool used:
xtensa-esp-elf-cc (crosstool-NG esp-13.2.0_20240530) 13.2.0