Update versions in readme's after release (#5883)

It didn't work in CI:
https://github.com/transloadit/uppy/actions/runs/16771298008/job/47486827416#step:16:1

Instead of trying to hack in an extra commit, now a script runs on the
`version` command, which resolves the versions based on changesets,
which is ran before `publish` so it should become part of the changeset
commit (hopefully)

scripts/update-readme-versions.mjs

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+import { execSync } from 'node:child_process'
+import { readFileSync, writeFileSync } from 'node:fs'
+
+// Get the current uppy version
+const packageJsonOutput = execSync(
+  'yarn workspace uppy exec npm pkg get version',
+  { encoding: 'utf8' },
+)
+const versionMatch = packageJsonOutput.match(/"([0-9]+\.[0-9]+\.[0-9]+)"/)
+
+if (!versionMatch) {
+  console.log('Could not extract version from package.json')
+  process.exit(1)
+}
+
+const version = versionMatch[1]
+
+// Update README.md
+const readme = readFileSync('README.md', 'utf8')
+const updatedReadme = readme.replace(
+  /https:\/\/releases\.transloadit\.com\/uppy\/v[0-9]+\.[0-9]+\.[0-9]+\//g,
+  `https://releases.transloadit.com/uppy/v${version}/`,
+)
+
+if (readme !== updatedReadme) {
+  writeFileSync('README.md', updatedReadme)
+  console.log('Updated README.md')
+} else {
+  console.log('README.md already up to date')
+}
+
+// Update BUNDLE-README.md
+const bundleReadme = readFileSync('BUNDLE-README.md', 'utf8')
+const updatedBundleReadme = bundleReadme.replace(
+  /https:\/\/releases\.transloadit\.com\/uppy\/v[0-9]+\.[0-9]+\.[0-9]+\//g,
+  `https://releases.transloadit.com/uppy/v${version}/`,
+)
+
+if (bundleReadme !== updatedBundleReadme) {
+  writeFileSync('BUNDLE-README.md', updatedBundleReadme)
+  console.log('Updated BUNDLE-README.md')
+} else {
+  console.log('BUNDLE-README.md already up to date')
+}