Bump pip from 24.1.1 to 25.2 in /ai/python-rag-chatbot

Bumps [pip](https://github.com/pypa/pip) from 24.1.1 to 25.2.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@24.1.1...25.2)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '25.2'
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

ai/python-rag-chatbot/requirements.txt

@@ -154,7 +154,7 @@ pathspec==                                 0.11.2
 pexpect==                                  4.8.0
 pickleshare==                              0.7.5
 piglet-templates==                         1.3.1
-pip==                                      24.1.1
+pip== 25.2
 platformdirs==                             3.11.0
 posthog==                                  3.0.2
 prometheus-client==                        0.17.1