Use the correct scala_test setup

BUILD.bazel

@@ -14,7 +14,6 @@
 #
 ################################################################################
 #
-load("@io_bazel_rules_scala//testing:testing.bzl", "setup_scala_testing_toolchain")
 load("@bazel_gazelle//:def.bzl", "gazelle")
 load("@python_versions//3.11:defs.bzl", "compile_pip_requirements")
 
@@ -33,15 +32,3 @@ compile_pip_requirements(
     requirements_txt = "requirements_lock.txt",
 )
 
-setup_scala_testing_toolchain(
-    name = "scalatest_toolchain",
-    scalatest_classpath = [
-       "@maven//:org_scalactic_scalactic_2_13",
-       "@maven//:org_scalatest_scalatest_2_13",
-       "@maven//:org_scalatest_scalatest_compatible",
-       "@maven//:org_scalatest_scalatest_core_2_13",
-       "@maven//:org_scalatest_scalatest_flatspec_2_13",
-       "@maven//:org_scalatest_scalatest_matchers_core_2_13",
-       "@maven//:org_scalatest_scalatest_mustmatchers_2_13",
-    ],
-)

MODULE.bazel

@@ -35,13 +35,6 @@ maven.install(
         "org.seleniumhq.selenium:selenium-remote-driver:4.27.0",
         "org.seleniumhq.selenium:selenium-api:4.27.0",
         "junit:junit:4.13.2",
-        "org.scalactic:scalactic_2.13:3.2.19",
-        "org.scalatest:scalatest_2.13:3.2.19",
-        "org.scalatest:scalatest-compatible:3.2.19",
-        "org.scalatest:scalatest-core_2.13:3.2.19",
-        "org.scalatest:scalatest-flatspec_2.13:3.2.19",
-        "org.scalatest:scalatest-matchers-core_2.13:3.2.19",
-        "org.scalatest:scalatest-mustmatchers_2.13:3.2.19",
     ],
 )
 
@@ -65,7 +58,16 @@ use_repo(pip, "rules_webtesting_py_deps")
 
 ##### Scala dependencies #####
 
-register_toolchains('//:scalatest_toolchain')
+scala_deps = use_extension(
+    "@io_bazel_rules_scala//scala/extensions:deps.bzl",
+    "scala_deps",
+)
+scala_deps.settings(
+    fetch_sources = True,
+)
+scala_deps.toolchains(
+    scalatest = True,
+)
 
 ##### Browsers dependencies #####
 browser_repositories = use_extension("//web/versioned:browsers-0.3.3.bzl", "browser_repositories_extension")