BREAKING CHANGE: Update minimum Node.js version from 20.x to 24.x (#1759)

Fixes
github/continuous-ai-for-accessibility#35
(Hubber access only)

This PR updates the runtime for each action in this repo to `node24`.

> [!CAUTION]
> This is a breaking change for outdated [self-hosted
runners](https://docs.github.com/en/actions/concepts/runners/self-hosted-runners).
Self-hosted runners must be updated to
[v2.327.1](https://github.com/actions/runner/releases/tag/v2.327.1)
(released on 2025-07-25; the first version to support `runs.using:
node24`) or later, or the actions won’t run.

Per https://github.com/nodejs/release#release-schedule:
- Node.js 20.x is in maintenance; it reaches end-of-life on 2026-04-30.
- Node.js 22.x is the active LTS release (but it’s [not supported by the
actions
runtime](https://docs.github.com/en/actions/reference/workflows-and-actions/metadata-syntax#runsusing-for-javascript-actions)).
- Node.js 24.x is the current release; it will become the active LTS
release on 2025-10-28 (i.e. 19 days from now).

Author: smockle

.github/actions/auth/action.yml

@@ -17,7 +17,7 @@ outputs:
     description: "Stringified JSON object containing 'username', 'password', 'cookies', and/or 'localStorage' from an authenticated session"
 
 runs:
-  using: "node20"
+  using: "node24"
   main: "bootstrap.js"
 
 branding:

.github/actions/file/action.yml

@@ -32,9 +32,9 @@ outputs:
     description: "DEPRECATED: List of URLs for repeated issues, as stringified JSON"
 
 runs:
-  using: "node20"
+  using: "node24"
   main: "bootstrap.js"
 
 branding:
   icon: "compass"
-  color: "blue"
+  color: "blue"

.github/actions/find/action.yml

@@ -15,7 +15,7 @@ outputs:
     description: "List of potential accessibility gaps, as stringified JSON"
 
 runs:
-  using: "node20"
+  using: "node24"
   main: "bootstrap.js"
 
 branding:

.github/actions/fix/action.yml

@@ -16,9 +16,9 @@ inputs:
     required: true
 
 runs:
-  using: "node20"
+  using: "node24"
   main: "bootstrap.js"
 
 branding:
   icon: "compass"
-  color: "blue"
+  color: "blue"