fix(danger): use correct bit size for octal escape parsing

CodeQL flagged incorrect type conversion: strconv.ParseUint was parsing
into a 16-bit target (8, 16) then casting to uint8 without bounds checking.

Since octal escapes in bash are always mod 256 (fit in uint8), parse
directly as 8-bit (8, 8) to ensure the conversion is safe and eliminate
the CodeQL warning.

All tests pass including TestHardening_ANSICOctalDigitCap.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: jkyberneees

internal/danger/classifier.go

@@ -887,7 +887,7 @@ func decodeEscape(s string, b *strings.Builder) int {
 			for end < len(s) && end < 4 && s[end] >= '0' && s[end] <= '7' {
 				end++
 			}
-			if v, err := strconv.ParseUint(s[1:end], 8, 16); err == nil {
+			if v, err := strconv.ParseUint(s[1:end], 8, 8); err == nil {
 				b.WriteByte(byte(v)) // bash takes octal escapes mod 256
 				return end
 			}