CI: Add Linux loong64 build task (#2609)

* CI: add Linux loongarch64 build tasks

* Fix: rename goarch from loongarch64 to loong64

* chore: go mod tidy

* Chore: bump github.com/refraction-networking/utls from 1.3.2 to 1.3.3 (#2611)

Bumps [github.com/refraction-networking/utls](https://github.com/refraction-networking/utls) from 1.3.2 to 1.3.3.
- [Release notes](https://github.com/refraction-networking/utls/releases)
- [Commits](https://github.com/refraction-networking/utls/compare/v1.3.2...v1.3.3)

---
updated-dependencies:
- dependency-name: github.com/refraction-networking/utls
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* CI: add Linux loongarch64 build tasks

* Fix: rename goarch from loongarch64 to loong64

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/release.yml

@@ -74,6 +74,8 @@ jobs:
             goarch: arm64
           - goos: linux
             goarch: riscv64
+          - goos: linux
+            goarch: loong64
           - goos: windows
             goarch: arm64
           - goos: android