Extract versioned _JUNIT_DEPS in test/BUILD

Eliminates reliance on the default `@io_bazel_rules_scala_junit_junit`
artifact repository.

test/BUILD

@@ -1,5 +1,3 @@
-load("@rules_python//python:defs.bzl", "py_binary")
-load("@rules_java//java:defs.bzl", "java_binary", "java_library")
 load(
     "//scala:scala.bzl",
     "scala_binary",
@@ -13,10 +11,18 @@ load(
     "scala_test",
     "scala_test_suite",
 )
+load("//scala:scala_cross_version.bzl", "repositories")
 load(":check_statsfile.bzl", "check_statsfile")
+load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_VERSION")
+load("@rules_java//java:defs.bzl", "java_binary", "java_library")
+load("@rules_python//python:defs.bzl", "py_binary")
 
 package(default_testonly = 1)
 
+_JUNIT_DEPS = repositories(SCALA_VERSION, [
+    "@io_bazel_rules_scala_junit_junit",
+])
+
 # The examples below show how to combine Scala and Java rules.
 # ScalaBinary is the Scala equivalent of JavaBinary.
 
@@ -491,7 +497,6 @@ scala_junit_test(
         "//test/src/main/resources/java_sources:CompiledWithJava11",
         "//test/src/main/resources/java_sources:CompiledWithJava8",
     ],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
 )
 
 # Generate a file containing the rootpaths of a Scala binary.
@@ -612,7 +617,7 @@ scala_library(
 scala_library(
     name = "customJunitRunner",
     srcs = ["src/main/scala/scalarules/test/junit/JunitCustomRunner.java"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 # make sure making a fat jar strips signatures
@@ -698,7 +703,7 @@ check_statsfile("ScalaLibBinary")
 scala_library(
     name = "JunitSeparateTarget",
     srcs = ["src/main/scala/scalarules/test/junit/separate_target/JunitSeparateTargetTest.scala"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 scala_junit_test(
@@ -712,7 +717,7 @@ scala_junit_test(
 java_library(
     name = "JunitJavaSeparateTarget",
     srcs = ["src/main/scala/scalarules/test/junit/separate_target/JunitJavaSeparateTargetTest.java"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 scala_junit_test(
@@ -726,14 +731,14 @@ scala_junit_test(
 scala_library(
     name = "TargetWithTestThatShouldNotRun",
     srcs = ["src/main/scala/scalarules/test/junit/separate_target/FailingTest.scala"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 scala_library(
     name = "JunitSeparateTargetWithDependencyOnTest",
     srcs = ["src/main/scala/scalarules/test/junit/separate_target/JunitSeparateTargetTest.scala"],
     runtime_deps = [":TargetWithTestThatShouldNotRun"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 scala_junit_test(
@@ -748,7 +753,7 @@ java_library(
     name = "JunitSeparateJavaTargetWithDependencyOnTest",
     srcs = ["src/main/scala/scalarules/test/junit/separate_target/JunitJavaSeparateTargetTest.java"],
     runtime_deps = [":TargetWithTestThatShouldNotRun"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 scala_junit_test(
@@ -765,7 +770,7 @@ scala_library(
         "src/main/scala/scalarules/test/junit/separate_target/JunitJavaSeparateTargetTest.java",
         "src/main/scala/scalarules/test/junit/separate_target/SomeScalaClass.scala",
     ],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 scala_junit_test(
@@ -783,7 +788,7 @@ scala_library(
     ],
     # make sure java compilation toolchain matches runtime toolchain ie --target
     java_compile_toolchain = "@bazel_tools//tools/jdk:toolchain_java11",
-    deps = ["@io_bazel_rules_scala_junit_junit"],
+    deps = _JUNIT_DEPS,
 )
 
 scala_junit_test(
@@ -800,7 +805,6 @@ scala_junit_test(
     size = "small",
     srcs = ["src/main/scala/scalarules/test/junit/JunitNoTestEnvironmentTest.scala"],
     suffixes = ["Test"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
 )
 
 scala_junit_test(
@@ -811,7 +815,6 @@ scala_junit_test(
         "my_env_var": "my_value",
     },
     suffixes = ["Test"],
-    deps = ["@io_bazel_rules_scala_junit_junit"],
 )
 
 py_binary(