build-unit-test-docker: lcov: update to 1.16

The 1.16 release is now used in upstream poky.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I7c4170c7196378f52d1bcaee2178ae3683b0456c
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index e89da8d..a6cf554 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -162,9 +162,8 @@
         rev="json-c-0.17-20230812",
         build_type="cmake",
     ),
-    # Snapshot from 2019-05-24
     "linux-test-project/lcov": PackageDef(
-        rev="v1.15",
+        rev="v1.16",
         build_type="make",
     ),
     "LibVNC/libvncserver": PackageDef(