Lock Chromatic GitHub action to 11.4

We have seen Chromatic failing with the following error. This
apparently occurs after updating to versio 11.5 of the GitHub Action.

Try to lock it at 11.4 to address this. Dependabot should help us
update in the future.

Error: error:0308010C:digital envelope routines::unsupported
    at new Hash (node:internal/crypto/hash:68:19)
    at Object.createHash (node:crypto:138:10)
    at module.exports (/home/runner/work/dpl-design-system/dpl-design-system/node_modules/@storybook/builder-webpack4/node_modules/webpack/lib/util/createHash.js:135:53)
    at NormalModule._initBuildHash (/home/runner/work/dpl-design-system/dpl-design-system/node_modules/@storybook/builder-webpack4/node_modules/webpack/lib/NormalModule.js:417:16)
    at handleParseError (/home/runner/work/dpl-design-system/dpl-design-system/node_modules/@storybook/builder-webpack4/node_modules/webpack/lib/NormalModule.js:471:10)
    at /home/runner/work/dpl-design-system/dpl-design-system/node_modules/@storybook/builder-webpack4/node_modules/webpack/lib/NormalModule.js:503:5
    at /home/runner/work/dpl-design-system/dpl-design-system/node_modules/@storybook/builder-webpack4/node_modules/webpack/lib/NormalModule.js:358:12
    at /home/runner/work/dpl-design-system/dpl-design-system/node_modules/loader-runner/lib/LoaderRunner.js:373:3
    at iterateNormalLoaders (/home/runner/work/dpl-design-system/dpl-design-system/node_modules/loader-runner/lib/LoaderRunner.js:214:10)
    at /home/runner/work/dpl-design-system/dpl-design-system/node_modules/loader-runner/lib/LoaderRunner.js:205:4
    at /home/runner/work/dpl-design-system/dpl-design-system/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:85:15
    at process.processTicksAndRejections (node:internal/process/task_queues:77:11) {
  opensslErrorStack: [ 'error:03000086:digital envelope routines::initialization error' ],
  library: 'digital envelope routines',
  reason: 'unsupported',
  code: 'ERR_OSSL_EVP_UNSUPPORTED'
}

.github/workflows/chromatic.yml

@@ -19,7 +19,7 @@ jobs:
       - run: yarn css:build
 
       - name: Publish to Chromatic
-        uses: chromaui/action@v11
+        uses: chromaui/action@v11.4.1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           projectToken: c6b96f9648b6