Use released version of YARP gem

[andyw8]

(PR is against yarp branch, not expected to be passing yet).

[andyw8]

Updated to also have yarp in the .gemspec.

[vinistock]

Good point, we don't need it in the Gemfile, just in the gemspec.

[github-actions]

Benchmark results in seconds (slowest at top)
textDocument/completion average: 0.267958 std_dev: 0.004969
textDocument/diagnostic average: 0.038847 std_dev: 0.010171
textDocument/definition average: 0.005467 std_dev: 0.00294
textDocument/selectionRange average: 0.004012 std_dev: 0.000465
textDocument/documentHighlight average: 0.002461 std_dev: 0.00018
textDocument/codeLens average: 0.002445 std_dev: 0.000171
textDocument/documentLink average: 0.002428 std_dev: 0.000182
textDocument/semanticTokens/full average: 0.002391 std_dev: 0.000265
textDocument/documentSymbol average: 0.002387 std_dev: 0.000144
textDocument/foldingRange average: 0.002224 std_dev: 0.000167
textDocument/semanticTokens/range average: 0.001594 std_dev: 6.3e-05
codeAction/resolve average: 0.001363 std_dev: 9.7e-05
textDocument/inlayHint average: 0.001355 std_dev: 9.3e-05
textDocument/hover average: 0.001326 std_dev: 0.000104
textDocument/onTypeFormatting average: 0.000813 std_dev: 8.1e-05
textDocument/formatting average: 0.000801 std_dev: 0.000291
textDocument/codeAction average: 0.00079 std_dev: 7.3e-05
================================================================================
Comparison with main branch:
textDocument/semanticTokens/full unchanged
textDocument/semanticTokens/range unchanged
textDocument/documentSymbol unchanged
textDocument/foldingRange unchanged
textDocument/formatting unchanged
textDocument/diagnostic unchanged
textDocument/documentLink unchanged
textDocument/inlayHint unchanged
textDocument/selectionRange unchanged
textDocument/documentHighlight unchanged
textDocument/hover unchanged
textDocument/codeAction unchanged
textDocument/onTypeFormatting unchanged
codeAction/resolve unchanged
textDocument/completion unchanged
textDocument/codeLens unchanged
textDocument/definition unchanged
================================================================================
Missing benchmarks:
RubyLsp::Requests::ShowSyntaxTree