Bump itsi from 0.2.21.rc1 to 0.2.21

[dependabot]

Bumps itsi from 0.2.21.rc1 to 0.2.21.

Changelog

Sourced from itsi's changelog.

[0.2.21] - 2026-02-16

• Fix Ruby 2.7 startup NameError in static_assets redirect schema load path

[0.2.21-rc1] - 2026-01-08

• Removed Rust target-cpu=native to avoid illegal instruction on older CPUs.

[0.2.20] - 2025-09-01

• Ensured Itsi server can run within a read-only file-system

[0.2.19] - 2025-08-09

• Fixed shutdown hook incorrectly being skipped
• Documentation fixes
• Fixed stuck graceful shutdown scenario

[0.2.18] - 2025-06-20

• Fixing error in auto-reload on Linux when reuse_port is false
• Fix breaking of auto-reload on config file errors
• include directive is relative (equivalent to require_relative)
• Fixing preload gem group logic
• Fix errors in interrupt handling during some debug flows

[0.2.17] - 2025-05-31

• Enabled vectorized writes in IoSteam
• Replaced all usage of heap-allocated BoxBody with HttpBody enums
• Add 5 threads as default for rack/handler
• Reserve header size ahead of time in rack interface
• Avoid intermediate array allocation when populating Rack env headers.
• Rewrite synchronous thread worker to avoid excessive GVL acquisition
• Revert to default write_ev behaviour for http1
• Switch to service_fn from service struct to avoid one additional pinned future
• Worker pinning accepts ruby workers too
• Fixed ordering incomaptibility in etag forwarding from static file server
• Added embedded benchmark suite

[0.2.16] - 2025-05-02

• Optimized static error responses
• Optimized rate limit middleware
• Made default static serve command use more efficient defaults
• Reduced cloning in main accept-loop
• Fixed ability to set nodelay to false.
• Added send_buffer_size option.
• Worker pinning accepts ruby workers too
• Fixed ordering incomaptibility in etag forwarding from static file server

[0.2.14] - 2025-04-30

• Support new-line separated headers for Rack 2 backward compatibility.

[0.2.12] - 2025-04-29

• Max Rust edition is now "2021"
• Removed invalid rbs files causing RI doc generation failure

... (truncated)

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