chore(coverity): update help message

When asked to download the Coverity Build tool (through the
'--get-coverity-tool' flag), the 'run_coverity_on_tf.sh' script prints a
help message after it has successfully downloaded and unpacked the
tool's tarball.

Update this help message to reflect the latest version of the
tool (2023.6.2) so users should be able to directly copy and paste the
sample command in their shell.

Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Change-Id: I7009439ed04a218d6eaaaf480dc089a44aef1386
diff --git a/script/tf-coverity/run_coverity_on_tf.py b/script/tf-coverity/run_coverity_on_tf.py
index e3c2951..9a7bebb 100755
--- a/script/tf-coverity/run_coverity_on_tf.py
+++ b/script/tf-coverity/run_coverity_on_tf.py
@@ -51,7 +51,8 @@
 
     print("\nNow please load the Coverity tool in your PATH...")
     print("E.g.:")
-    cov_dir_name = tarball_name(coverity_tarball)
+    cov_version = "2023.6.2"
+    cov_dir_name = "cov-analysis-linux64-" + cov_version
     cov_dir_path = os.path.abspath(os.path.join(cov_dir_name, "bin"))
     print("  export PATH=%s$PATH" % (cov_dir_path + os.pathsep))