Add skylib to tests MODULE.bazel

Author: jjudd

tests/MODULE.bazel

@@ -1,5 +1,6 @@
 module(name = "rules_scala_annex_tests")
 
+bazel_dep(name = "bazel_skylib", version = "1.7.1")
 bazel_dep(name = "protobuf", version = "29.3")
 bazel_dep(name = "rules_java", version = "8.9.0")
 bazel_dep(name = "rules_jvm_external", version = "6.5")