imgtool: bump minimal required version to 2.2.0

AlexFabre · nordicjm · commit 78d94cf47474 · 2025-06-25T09:49:28.000+01:00
Making 2.2.0 the minimum required version of imgtool, to benefit from
its numerous fixes.

Signed-off-by: Alex Fabre &lt;alex.fabre@rtone.fr&gt;
diff --git a/zephyr/requirements.txt b/zephyr/requirements.txt
@@ -1,2 +1,2 @@
 cbor>=1.0.0
-imgtool>=2.1.0
+imgtool>=2.2.0
