Bump pip from 25.2 to 25.3 in /requirements (#24075)

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

Author: dependabot[bot]

requirements/pip.txt

@@ -1,5 +1,5 @@
 ## Requirements needed to be installed *before* any other requirements.
 ## This makes sure we have the latest version of pip.
-pip==25.2 \
-    --hash=sha256:578283f006390f85bb6282dffb876454593d637f5d1be494b5202ce4877e71f2 \
-    --hash=sha256:6d67a2b4e7f14d8b31b8b52648866fa717f45a1eb70e83002f4331d07e953717
+pip==25.3 \
+    --hash=sha256:8d0538dbbd7babbd207f261ed969c65de439f6bc9e5dbd3b3b9a77f25d95f343 \
+    --hash=sha256:9655943313a94722b7774661c21049070f6bbb0a1516bf02f7c8d5d9201514cd