Add initial repositories for Scala 3.1 (#1342)

Author: liucijus

third_party/repositories/repositories.bzl

@@ -1,6 +1,7 @@
 load("//third_party/repositories:scala_2_11.bzl", _artifacts_2_11 = "artifacts")
 load("//third_party/repositories:scala_2_12.bzl", _artifacts_2_12 = "artifacts")
 load("//third_party/repositories:scala_2_13.bzl", _artifacts_2_13 = "artifacts")
+load("//third_party/repositories:scala_3_1.bzl", _artifacts_3_1 = "artifacts")
 load(
     "@io_bazel_rules_scala//scala:scala_cross_version.bzl",
     "default_maven_server_urls",
@@ -15,6 +16,7 @@ artifacts_by_major_scala_version = {
     "2.11": _artifacts_2_11,
     "2.12": _artifacts_2_12,
     "2.13": _artifacts_2_13,
+    "3.1": _artifacts_3_1,
 }
 
 def repositories(