[BUG] Can't perform CI deployments using firebase-tools 14.0

### Action config

```
- name: Deploy To Firebase Hosting
uses: FirebaseExtended/action-hosting-deploy@v0
env:
FIREBASE_CLI_EXPERIMENTS: webframeworks
PUBLIC_BACKEND_BASE_URL: ${{ vars.PUBLIC_BACKEND_BASE_URL }}
PUBLIC_SITE_URL: ${{ vars.PUBLIC_SITE_URL }}
PUBLIC_FIREBASE_API_KEY: ${{ vars.PUBLIC_FIREBASE_API_KEY }}
PUBLIC_FIREBASE_AUTH_DOMAIN: ${{ vars.PUBLIC_FIREBASE_AUTH_DOMAIN }}
PUBLIC_FIREBASE_PROJECT_ID: ${{ vars.PUBLIC_FIREBASE_PROJECT_ID }}
PUBLIC_FIREBASE_STORAGE_BUCKET: ${{ vars.PUBLIC_FIREBASE_STORAGE_BUCKET }}
PUBLIC_FIREBASE_MESSAGING_SENDER_ID: ${{ vars.PUBLIC_FIREBASE_MESSAGING_SENDER_ID }}
PUBLIC_FIREBASE_APP_ID: ${{ vars.PUBLIC_FIREBASE_APP_ID }}
{ ... }
with:
repoToken: '${{ secrets.GITHUB_TOKEN }}'
firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT }}'
projectId: ${{ vars.PUBLIC_FIREBASE_PROJECT_ID }}
entryPoint: './apps/frontend'
channelId: live
target: ${{ github.ref_name == 'staging' && 'staging' || (github.ref_name == 'production-frontend' || github.ref_name == 'production') && 'production' || 'dev' }}
```

-->

### Error message

```
[2025-03-28T16:14:26.857Z] Functions deploy failed.
[2025-03-28T16:14:26.857Z] ***
[2025-03-28T16:14:26.857Z] TypeError: Cannot read properties of null (reading 'length')
at Object.formatServiceAccount (/home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/gcp/proto.js:95:24)
at /home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/gcp/cloudfunctionsv2.js:196:122
at Object.convertIfPresent (/home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/gcp/proto.js:45:25)
at Object.functionFromEndpoint (/home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/gcp/cloudfunctionsv2.js:196:11)
at Fabricator.createV2Function (/home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/deploy/functions/release/fabricator.js:233:35)
at Fabricator.createEndpoint (/home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/deploy/functions/release/fabricator.js:137:24)
at /home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/deploy/functions/release/fabricator.js:103:64
at handle (/home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/deploy/functions/release/fabricator.js:89:23)
at Fabricator.applyChangeset (/home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/deploy/functions/release/fabricator.js:103:26)
at /home/runner/.npm/_npx/ba4f1959e38407b5/node_modules/firebase-tools/lib/deploy/functions/release/fabricator.js:69:40

Error: There was an error deploying functions

The process '/opt/hostedtoolcache/node/20.19.0/x64/bin/npx' failed with exit code 2
Error: The process '/opt/hostedtoolcache/node/20.19.0/x64/bin/npx' failed with exit code 2
***
conclusion: 'failure',
output: ***
title: 'Deploy preview failed',
summary: "Error: The process '/opt/hostedtoolcache/node/20.19.0/x64/bin/npx' failed with exit code 2"
***
***
```

### Expected behavior

The deployment should be performed flawlessly, like it was previously on version 13.35.1. We had to manually set the 13.35.1 version after several deployments attempts, and only then the deployment worked.

### Actual behavior

The deploy stops even if the project build succeeds. The error message is listed above.