CI - Fix Building(CMake) on Windows 2019

[volovikariel]

Motivation: I don't want CI builds to fail (see #3851). This PR addresses the Windows 2019 Building(CMake) failures.

Problem analysis: Windows 2019 Building(CMake) runs are failing for us: https://github.com/flameshot-org/flameshot/actions/runs/13554611383/job/37886033174

The failures occur in the QT Install step:

flameshot/.github/workflows/build_cmake.yml

Lines 109 to 114 in aad3a5e

	- name: Install Qt
	uses: jurplel/install-qt-action@v2
	with:
	version: 5.15.2
	target: desktop
	dir: '${{ github.workspace }}/build/'

I spent some time looking into it, and it looks like jurplel/install-qt-action is was also having issues with python version 3.13. See this commit, which limits their python versions to 3.12 now: jurplel/install-qt-action@fc214cc

Proposed solution:
Going from jurplel/install-qt-action@v2 to jurplel/install-qt-action@v4 should fix the issue (as their commit was made to v4).

My tests:
This change seems to make the build pass: https://github.com/volovikariel/flameshot/actions/runs/13568251686/job/37926340193?pr=7

[mmahmoudian]

Thanks for the PR and detailed explanation of your investigation. I went somewhat down the rabbit-hole some weeks back, but I didn't dive until the end (i.e. into the jurplel/install-qt-action. This was educational for me. Thanks.

[mmahmoudian]

Well, checking my local git diff says that I narrowed it down to jurplel/install-qt-action but just bumped the version one up hoping to fix the issue, which didn't and therefore no PR 😅

Thanks again.