style: fix deprecations

Use `dyn` for trait objects and use `..=` for inclusive ranges.

grep-matcher/src/interpolate.rs

@@ -134,7 +134,7 @@ fn find_cap_ref(replacement: &[u8]) -> Option<CaptureRef> {
 /// Returns true if and only if the given byte is allowed in a capture name.
 fn is_valid_cap_letter(b: &u8) -> bool {
     match *b {
-        b'0' ... b'9' | b'a' ... b'z' | b'A' ... b'Z' | b'_' => true,
+        b'0' ..= b'9' | b'a' ..= b'z' | b'A' ..= b'Z' | b'_' => true,
         _ => false,
     }
 }