Release: java_tools_javac11-v10.1 (with Java 15 toolchain support)

[davido]

Now, that bazelbuild/bazel#11871 is landed, there should be new release with JDK 15 toolchain support.

Ideally, Bazel would consume this new java_tools per default, so that Bazel users could just select between supported toolchains: 8, 11, 14 and 15.

[davido]

//Cc @philwo @comius @Jonpez2

[comius]

There is a failing test for java_tools on linux bazelbuild/bazel#12244

[comius]

Creating release artifacts for rc1: https://buildkite.com/bazel-trusted/java-tools-binaries-java/builds/149

[comius]

Testing release candidates: bazelbuild/bazel#12302 and https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/1711

[comius]

All tests green, except for bazelisk on Windows, which seems unrelated.

Published the release: https://github.com/bazelbuild/java_tools/releases/tag/javac11_v10.1

[davido]

Thanks!