Fix sprintf usage

Changes a recent introduction of sprintf to snprintf since sprintf is
deprecated in Chromium.

Bug: crashpad:329
Change-Id: Icd346da4c86bd8e867266dfebaf617991dd90113
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/4261633
Reviewed-by: Joshua Peraza <jperaza@chromium.org>

src/processor/minidump.cc

@@ -5492,7 +5492,7 @@ void MinidumpCrashpadInfo::Print() {
         // Value represents something else.
         char buffer[3];
         for (const uint8_t& v : annot.value) {
-          sprintf(buffer, "%X", v);
+          snprintf(buffer, sizeof(buffer), "%X", v);
           str_value.append(buffer);
         }
       }