HTTPUpdate: Support HTTP 204

[sidwarkd]

Description of Change

HTTP 204 is a successful return code which indicates No Content. While it's appropriate to return a 304 if the server has content for a device but it hasn't change, it is more accurate for a server to return a 204 if it simply doesn't have any firmware files for a particular device.

Tests scenarios

Change is hardware independent and relies on the HTTP return code. Will work on all supported hardware. Tested on Arduino-esp32 core v3.2.0 with ESP32 Devkit C board.

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Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Support HTTP 204": body's lines must not be longer than 100 characters summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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Test Results

 76 files   76 suites   12m 43s ⏱️
 38 tests  38 ✅ 0 💤 0 ❌
241 runs  241 ✅ 0 💤 0 ❌

Results for commit 805905d.

♻️ This comment has been updated with latest results.