WIP: Bzlmod part the thirty-fourth

Added a couple more repo dependencies to targets under //test.

However, `bazel test //test:all` is a bust for now, because the
protoc-bridge mechanism hangs on macOS:

- scalapb/protoc-bridge#366
- scalapb/protoc-bridge#367
- scalapb/protoc-bridge#379
- scalapb/protoc-bridge#380

Though scalapb/protoc-bridge#366 suggests that it only hangs
occasionally, it's hanging 100% of the time for me on macOS 15.0 on a M3
Max.

test/BUILD

@@ -610,9 +610,14 @@ scala_library(
     ],
 )
 
+junit_deps = [
+    "@io_bazel_rules_scala_junit_junit" + version_suffix(SCALA_VERSION)
+]
+
 scala_library(
     name = "customJunitRunner",
     srcs = ["src/main/scala/scalarules/test/junit/JunitCustomRunner.java"],
+    deps = junit_deps,
 )
 
 # make sure making a fat jar strips signatures
@@ -696,10 +701,6 @@ check_statsfile("ScalaLibBinary")
 
 #discovering tests from a separate target
 
-junit_deps = [
-    "@io_bazel_rules_scala_junit_junit" + version_suffix(SCALA_VERSION)
-]
-
 scala_library(
     name = "JunitSeparateTarget",
     srcs = ["src/main/scala/scalarules/test/junit/separate_target/JunitSeparateTargetTest.scala"],

test/src/main/scala/scalarules/test/fetch_sources/BUILD

@@ -4,4 +4,5 @@ scala_library(
     name = "fetch_sources",
     testonly = True,
     srcs = ["FetchSources.scala"],
+    deps = ["@com_google_guava_guava_21_0"],
 )