tf-a-lts-triage-v2.yaml: fix attachment variable

Based on https://www.jenkins.io/doc/pipeline/steps/email-ext/
the email-ext plugin expects the attachment variable name
as `attachmentsPattern`, so fixup to use the same.

Change-Id: Ia473e81532df879cffe2d73a642a339e30ea131b
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/tf-a-lts-triage-v2.yaml b/tf-a-lts-triage-v2.yaml
index 2445782..d9301e0 100644
--- a/tf-a-lts-triage-v2.yaml
+++ b/tf-a-lts-triage-v2.yaml
@@ -82,4 +82,4 @@
                 recipients: "arthur.she@linaro.org, bipin.ravi@arm.com, vwadekar@nvidia.com, joanna.farley@arm.com, lauren.wehrmeister@arm.com, yann.gautier@st.com, jidong@google.com, olivier.deprez@arm.com, Govindraj.Raja@arm.com, palmer@google.com"
                 subject: "TF-A LTS Triage report"
                 body: "Attached is the CSV report from the TF-A LTS Triage job this week."
-                attachments: "*.csv"
+                attachmentsPattern: "*.csv"