chore(deps): bump pip from 25.2 to 25.3 in /src/backend (#10690)

* chore(deps): bump pip from 25.2 to 25.3 in /src/backend

Bumps [pip](https://github.com/pypa/pip) from 25.2 to 25.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/25.2...25.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '25.3'
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

* fix style

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matthias Mair <code@mjmair.com>

src/backend/requirements-dev.txt

@@ -451,9 +451,9 @@ pdfminer-six==20250506 \
     --hash=sha256:b03cc8df09cf3c7aba8246deae52e0bca7ebb112a38895b5e1d4f5dd2b8ca2e7 \
     --hash=sha256:d81ad173f62e5f841b53a8ba63af1a4a355933cfc0ffabd608e568b9193909e3
     # via -r src/backend/requirements-dev.in
-pip==25.2 \
-    --hash=sha256:578283f006390f85bb6282dffb876454593d637f5d1be494b5202ce4877e71f2 \
-    --hash=sha256:6d67a2b4e7f14d8b31b8b52648866fa717f45a1eb70e83002f4331d07e953717
+pip==25.3 \
+    --hash=sha256:8d0538dbbd7babbd207f261ed969c65de439f6bc9e5dbd3b3b9a77f25d95f343 \
+    --hash=sha256:9655943313a94722b7774661c21049070f6bbb0a1516bf02f7c8d5d9201514cd
     # via pip-tools
 pip-tools==7.5.1 \
     --hash=sha256:a051a94794ba52df9acad2d7c9b0b09ae001617db458a543f8287fea7b89c2cf \