VS Code GitHub Actions extension shows incorrect linter errors for valid workflow syntax

I'm using VS Code and working on GitHub Actions workflow files. I'm using the GitHub Actions extension.

I'm having issues with the linter. VS Code is showing me some errors and warnings that are incorrect:

My workflow looks like:

on:
  push:
    branches:
      - main


jobs:
  my-job:
    if: "!startsWith(github.event.head_commit.message, 'special message')"
    runs-on: my-runner
    container:
      image: my-image
      credentials:
        username: ${{ secrets.MY_USERNAME }}
        password: ${{ secrets.MY_PASSWORD }}

VS Code is raising issues:

[{
    "resource": "my_workflow.yml",
    "owner": "_generated_diagnostic_collection_name_#4",
    "severity": 8,
    "message": "Unexpected symbol: '\"'. Located at position 1 within expression: \"!startsWith(github.event.head_commit.message, 'chore(main): release')\"",
    "startLineNumber": 8,
    "startColumn": 9,
    "endLineNumber": 8,
    "endColumn": 80,
    "origin": "extHost1"
},{
    "resource": "my_workflow.yml",
    "owner": "_generated_diagnostic_collection_name_#4",
    "severity": 4,
    "message": "Context access might be invalid: MY_USERNAME",
    "startLineNumber": 13,
    "startColumn": 19,
    "endLineNumber": 13,
    "endColumn": 45,
    "origin": "extHost1"
},{
    "resource": "my_workflow.yml",
    "owner": "_generated_diagnostic_collection_name_#4",
    "severity": 4,
    "message": "Context access might be invalid: MY_PASSWORD",
    "startLineNumber": 14,
    "startColumn": 19,
    "endLineNumber": 14,
    "endColumn": 45,
    "origin": "extHost1"
}]

But those are valid because the workflow runs properly.

My file is using the "GitHub Actions Workflow" syntax:

So I must be missing a setup somewhere.

How to fix those lints?