Change references to flashrom-stable

Adapt all mentions of the mailing list and also the version print.

Change-Id: Ib4a3271422ee6cf4d0efb8c3fa858b66a22c0a33
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/70922
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/digilent_spi.c b/digilent_spi.c
index 7431671..bcd73ae 100644
--- a/digilent_spi.c
+++ b/digilent_spi.c
@@ -375,7 +375,9 @@
 	int i;
 
 	if (handle != NULL) {
-		msg_cerr("%s: handle already set! Please report a bug at flashrom@flashrom.org\n", __func__);
+		msg_cerr("%s: handle already set!\n"
+			 "Please report a bug at flashrom-stable@flashrom.org\n",
+			 __func__);
 		return -1;
 	}