Update MCUBoot version to 7453075

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I18dee853419bfa95558395c55dfd0e13d5317f3a
diff --git a/tf-m-code-coverage.yaml b/tf-m-code-coverage.yaml
index 3683fc1..7538249 100644
--- a/tf-m-code-coverage.yaml
+++ b/tf-m-code-coverage.yaml
@@ -99,7 +99,7 @@
           description: "Name of Jenkins credential for authentication with LAVA."
       - string:
           name: 'MCUBOOT_REFSPEC'
-          default: 'v1.9.0'
+          default: '74530753b40150080f61cfd9277b1fa7d4e3fa6f'
           description: |
             Specify which MCUboot version to use
             refs/heads/<branch_name> : Pick up latest HEAD on branch