Bump downstream dependencies in CI (#14423)

Co-authored-by: pyca-boringbot[bot] <pyca-boringbot[bot]+106132319@users.noreply.github.com>

Author: pyca-boringbot[bot]

.github/workflows/ci.yml

@@ -459,8 +459,8 @@ jobs:
             PATH: mitmproxy
           - DOWNSTREAM: scapy
             REPO: secdev/scapy
-            # Latest commit on the scapy master branch, as of Mar 03, 2026.
-            REF: ed0707e84396b4db5382d281b86f85997cb13613
+            # Latest commit on the scapy master branch, as of Mar 05, 2026.
+            REF: 3147e108a3d9bdf93e527206fefbcdd372b06b3d
             PATH: scapy
           - DOWNSTREAM: sigstore-python
             REPO: sigstore/sigstore-python