This PR updates everything for 2027. This includes removing GradleRIO, simplifying our wpilib version defintion, updating APIs, updating to Java 21, and more.
Note that photonlibpy is failing because robotpy has not been fully updated yet. Examples are omitted because they need to be updated for our new PhotonPoseEstimator API and still need some changes from WPILIB. photonlib windows build is failing because we're waiting for some upstream changes. Finally, images are failing since they don't have Java 21 yet.
## Description
<!-- What changed? Why? (the code + comments should speak for itself on
the "how") -->
<!-- Fun screenshots or a cool video or something are super helpful as
well. If this touches platform-specific behavior, this is where test
evidence should be collected. -->
<!-- Any issues this pull request closes or pull requests this
supersedes should be linked with `Closes #issuenumber`. -->
Bump to wpilib 2026 beta. This does not bump our pythonlib, as robotpy
hasn't come out yet.
## Meta
Merge checklist:
- [ ] Pull Request title is [short, imperative
summary](https://cbea.ms/git-commit/) of proposed changes
- [ ] The description documents the _what_ and _why_
- [ ] This PR has been
[linted](https://docs.photonvision.org/en/latest/docs/contributing/linting.html).
- [ ] If this PR changes behavior or adds a feature, user documentation
is updated
- [ ] If this PR touches photon-serde, all messages have been
regenerated and hashes have not changed unexpectedly
- [ ] If this PR touches configuration, this is backwards compatible
with settings back to v2025.3.2
- [ ] If this PR touches pipeline settings or anything related to data
exchange, the frontend typing is updated
- [ ] If this PR addresses a bug, a regression test for it is added
---------
Co-authored-by: Gold856 <117957790+Gold856@users.noreply.github.com>
