Update pip in base-python to v26.0.1 (#353)

* https://pip.pypa.io/en/stable/news/#v26-0-1

Author: sairon

python/3.12/build.yaml

@@ -7,7 +7,7 @@ cosign:
   identity: https://github.com/home-assistant/docker-base/.*
 args:
   PYTHON_VERSION: "3.12.13"
-  PIP_VERSION: "25.3"
+  PIP_VERSION: "26.0.1"
   CERT_IDENTITY: thomas@python.org
   CERT_OIDC_ISSUER: https://accounts.google.com
 labels:

python/3.13/build.yaml

@@ -7,7 +7,7 @@ cosign:
   identity: https://github.com/home-assistant/docker-base/.*
 args:
   PYTHON_VERSION: "3.13.12"
-  PIP_VERSION: "25.3"
+  PIP_VERSION: "26.0.1"
   CERT_IDENTITY: thomas@python.org
   CERT_OIDC_ISSUER: https://accounts.google.com
 labels:

python/3.14/build.yaml

@@ -7,7 +7,7 @@ cosign:
   identity: https://github.com/home-assistant/docker-base/.*
 args:
   PYTHON_VERSION: "3.14.3"
-  PIP_VERSION: "25.3"
+  PIP_VERSION: "26.0.1"
   CERT_IDENTITY: hugo@python.org
   CERT_OIDC_ISSUER: https://github.com/login/oauth
 labels: