GitHub Actions: Fixed macos-latest workflow (#3760)

* `qbs` now depends on `qt` and not `qt5`
* Explicit linking appears to be no longer necessary

.github/workflows/macos-latest.yml

@@ -27,7 +27,6 @@ jobs:
     - name: Install dependencies
       run: |
         brew install qbs
-        brew link qt5 --force
 
     - name: Setup Qbs
       run: |

README.md

@@ -49,8 +49,7 @@ libraries have been installed as well as the Qbs build tool:
 * On Fedora:        `sudo dnf builddep tiled`
 * On Arch Linux:    `sudo pacman -S qt qt5-tools qbs`
 * On macOS with [Homebrew](https://brew.sh/):
-  + `brew install qbs`
-  + `brew link qt5 --force`
+  + `brew install qbs` (which automatically pulls in `qt`)
 
 If you want to build the Python plugin, you additionally need to install the
 Python 3 development libraries: