fast-forward-master.sh: Add SSH option to keep accepting ssh-rsa keys

Required with Ubuntu Jammy client. A workaround for
https://linaro.atlassian.net/browse/STG-4216

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Idb51685c8fde8c05e407582c6f2910fe915cd952
diff --git a/script/scratch_scripts/fast-forward-master.sh b/script/scratch_scripts/fast-forward-master.sh
index 4e88cd7..5178291 100755
--- a/script/scratch_scripts/fast-forward-master.sh
+++ b/script/scratch_scripts/fast-forward-master.sh
@@ -11,7 +11,7 @@
 
 mkdir -p ~/.ssh/
 ssh-keyscan -p 29418 review.trustedfirmware.org >> ~/.ssh/known_hosts
-export GIT_SSH_COMMAND="ssh -i $CI_BOT_KEY"
+export GIT_SSH_COMMAND="ssh -i $CI_BOT_KEY -o 'PubkeyAcceptedKeyTypes +ssh-rsa'"
 
 # Use a directory which won't clash with a r/o clone made for building.
 clone_dir=trusted-firmware-a-for-update