Bump pyqt5-qt5 from 5.15.2 to 5.15.15

Bumps [pyqt5-qt5](https://www.riverbankcomputing.com/software/pyqt/) from 5.15.2 to 5.15.15.

---
updated-dependencies:
- dependency-name: pyqt5-qt5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,6 +1,6 @@
 # Core application dependencies
 PyQt5==5.15.11
-PyQt5-Qt5==5.15.2
+PyQt5-Qt5==5.15.15
 PyQt5_sip==12.15.0
 psutil==6.0.0
 tqdm==4.66.5