Fix action.yml syntax (#15430)

# Objective

Fixes #15429 

## Solution

Fix type of default value

## Testing

We'll see if the CI still works I guess.

## Showcase


![image](https://github.com/user-attachments/assets/aeb376fe-1c88-4b1c-8c91-fd8f142c2378)

.github/actions/install-linux-deps/action.yml

@@ -20,19 +20,19 @@ inputs:
  alsa:
  description: Install alsa (libasound2-dev)
  required: false
- default: true
+ default: "true"
  udev:
  description: Install udev (libudev-dev)
  required: false
- default: true
+ default: "true"
  wayland:
  description: Install Wayland (libwayland-dev)
  required: false
- default: false
+ default: "false"
  xkb:
  description: Install xkb (libxkbcommon-dev)
  required: false
- default: false
+ default: "false"
 runs:
  using: composite
  steps: