⬆️ Update pip to v26 (#348)

Author: renovate[bot]

base/Dockerfile

@@ -11,7 +11,7 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 # Install base system
 ARG PYTHON_VERSION="v3.14.0"
 ARG PYTHON_SHA256="2299dae542d395ce3883aca00d3c910307cd68e0b2f7336098c8e7b7eee9f3e9"
-ARG PYTHON_PIP_VERSION="25.3"
+ARG PYTHON_PIP_VERSION="26.2.1"
 ARG PYTHON_SETUPTOOLS_VERSION="83.0.0"
 
 # hadolint ignore=DL3003,DL4006,SC2155