Update dependency pip to v25

Author: renovate[bot]

charmcraft.yaml

@@ -25,7 +25,7 @@ parts:
       # Use environment variable instead of `--break-system-packages` to avoid failing on older
       # versions of pip that do not recognize `--break-system-packages`
       # `--user` needed (in addition to `--break-system-packages`) for Ubuntu >=24.04
-      PIP_BREAK_SYSTEM_PACKAGES=true python3 -m pip install --user --upgrade pip==24.3.1  # renovate: charmcraft-pip-latest
+      PIP_BREAK_SYSTEM_PACKAGES=true python3 -m pip install --user --upgrade pip==25.2  # renovate: charmcraft-pip-latest
 
       # Use uv to install poetry so that a newer version of Python can be installed if needed by poetry
       curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.5.15/uv-installer.sh | sh  # renovate: charmcraft-uv-latest