Update dependency finch to ~> 0.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
finch (source)	prod	minor	~> 0.18 → ~> 0.21

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Release Notes

sneako/finch (finch)

v0.21.0

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Enhancements

• Add support for querying default pool metrics via Finch.get_pool_status/2 #​329
• Add more details on Finch.request/3 docs #​327

Bug Fixes

• Prevent idle HTTP/1 pools from being terminated while connections are in use #​292
• Disable unsupported HTTP/2 server push responses to avoid crashes #​333
• Drop :cacerts from defaults for HTTP connections to avoid breaking plain HTTP pools #​333
• Only track default pool metrics when start_pool_metrics? is enabled #​329

Other

• Elixir 1.19 compatibility updates for HTTP/1 pool state handling #​331
• CI: update test matrix and x509/deps for Elixir 1.19 #​330
• Add ALPN large-body regression test coverage (issue #​265) #​332

v0.20.0

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Enhancements

• Support manual pool termination #​299
• Refactor HTTP1 pool state for better maintainability #​308
• Add :supported_groups to list of TLS options #​307
• Be more explicit about the :default pool in documentation #​314
• Upgrade nimble_options to document deprecations #​315

Bug Fixes

• Fix Finch.stream_while/5 on halt for both HTTP/1 and HTTP/2 #​320
• Return accumulator when Finch.stream/5 and Finch.stream_while/5 fail #​295
• Fix documentation reference for get_pool_status/2 #​301

Other

• Upgrade CI VM to Ubuntu 24 #​321
• CI housekeeping: support Elixir 1.17/Erlang OTP 27, bump Credo and deps #​303
• Update GitHub CI badge URL #​304

v0.19.0

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Enhancements

• Update @​mint_tls_opts in pool_manager.ex #​266
• Document there is no backpressure on HTTP2 #​283
• Fix test: compare file size instead of map #​284
• Finch.request/3: Use improper list and avoid Enum.reverse #​286
• Require Mint 1.6 #​287
• Remove castore dependency #​274
• Fix typos and improve language in docs and comments #​285
• fix logo size in README #​275

Bug Fixes

• Tweak Finch supervisor children startup order #​289, fixes #​277
• implement handle_cancelled/2 pool callback #​268, fixes #​257
• type Finch.request_opt() was missing the :request_timeout option #​278

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