Update pip requirement from >=21.3.1 to >=26.1 (#35)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 colorlog==6.10.1
 homeassistant==2025.8.0
-pip>=21.3.1
+pip>=26.1
 ruff==0.15.11