shallow: give write_one_shallow() its own hex buffer

The previous fix reuses the local `hex` variable that is already
computed at the top of `write_one_shallow()`. That works today, but
`oid_to_hex()` returns a pointer into a small rotating buffer, so it is
not stable across an unrelated call to `oid_to_hex()` from the same
thread. A future edit that adds such a call between the assignment and
the last user of `hex` would silently corrupt the output.

Move `write_one_shallow()` off the rotating buffer entirely by using a
local buffer instead. The current users of that `hex` variable are
unchanged.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Assisted-by: Claude Opus 4.7
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

shallow.c

@@ -359,7 +359,9 @@ struct write_shallow_data {
 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 {
 	struct write_shallow_data *data = cb_data;
-	const char *hex = oid_to_hex(&graft->oid);
+	char hex[GIT_MAX_HEXSZ + 1];
+
+	oid_to_hex_r(hex, &graft->oid);
 	if (graft->nr_parent != -1)
 		return 0;
 	if (data->flags & QUICK) {