build: rename dependency variable

Per [1], the naming convention for dependencies is '<project_name>_dep',
for consistency when importing the project as a meson subproject.
Rename the variable here to match this convention.

Based on [2] there appears to not be any current users of this as a
subproject which would need to be updated.

1. https://mesonbuild.com/Subprojects.html#naming-convention-for-dependency-variables
2. https://github.com/search?q=org%3Aopenbmc+get_variable&type=code

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I66082b3f667e9d00ede02184d0b008d0dd22d36b
diff --git a/test/meson.build b/test/meson.build
index 6848112..97e219b 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -37,5 +37,5 @@
 foreach t : tests
   test(t, executable(t.underscorify(), t + '.cpp',
                      implicit_include_directories: false,
-                     dependencies: [sdeventplus, gtest, gmock]))
+                     dependencies: [sdeventplus_dep, gtest, gmock]))
 endforeach