chore: add dict.h and utf8.c to .gitignore

This will not change the trace status of these two files,
but it will allow some shell tools to stop caring about them.

This can reduce some of the distractions of development work.

.gitignore

@@ -7,3 +7,5 @@ src/*.o
 src/tt++
 src/.cache/
 src/compile_commands.json
+src/utf8.c
+src/dict.h