[bazel + java] Use a transition to target Java 11 for our maven artifacts

This allows us to use Java 21 elsewhere in the repo where it might be
useful (Tests! Tests! Tests!) without needing to monkey around with
special flags.

Author: shs96c

.bazelrc

@@ -20,14 +20,13 @@ build --flag_alias=headless=//common:headless
 
 # Set the default java toolchain
 
-build --java_language_version=17
-build --java_runtime_version=remotejdk_17
-build --tool_java_language_version=17
-build --tool_java_runtime_version=remotejdk_17
-
-# We target java 11 by default
-
-build --javacopt="--release 11"
+# This is the version of Java used by Selenium's build and tooling.
+# We use a transition in `export.bzl` to set the version of Java we
+# target for the binaries we ship to 11.
+build --java_language_version=21
+build --java_runtime_version=remotejdk_21
+build --tool_java_language_version=21
+build --tool_java_runtime_version=remotejdk_21
 
 # Require java dependencies to be used and first-order
 

MODULE.bazel

@@ -26,6 +26,7 @@ bazel_dep(name = "rules_pkg", version = "0.10.1")
 bazel_dep(name = "rules_python", version = "0.33.0")
 bazel_dep(name = "rules_proto", version = "6.0.0")
 bazel_dep(name = "rules_ruby", version = "0.13.0")
+bazel_dep(name = "with_cfg.bzl", version = "0.6.0")
 
 linter = use_extension("@apple_rules_lint//lint:extensions.bzl", "linter")
 linter.configure(

java/private/export.bzl

@@ -6,7 +6,12 @@ load(
 load("@rules_jvm_external//private/rules:maven_bom_fragment.bzl", "maven_bom_fragment")
 load("@rules_jvm_external//private/rules:maven_project_jar.bzl", "maven_project_jar")
 load("@rules_jvm_external//private/rules:maven_publish.bzl", "maven_publish")
-load("//java/private:module.bzl", "java_module")
+load("@with_cfg.bzl", "with_cfg")
+load("//java/private:module.bzl", _java_module = "java_module")
+
+_builder = with_cfg(_java_module)
+_builder.set("java_language_version", "11").set("java_runtime_version", "remotejdk_11")
+java_module, _ = _builder.build()
 
 def java_export(
         name,