Bump downstream dependencies in CI (#14134)

Co-authored-by: pyca-boringbot[bot] <pyca-boringbot[bot][email protected]>

Author: pyca-boringbot[bot]

.github/workflows/ci.yml

@@ -458,13 +458,13 @@ jobs:
             PATH: josepy
           - DOWNSTREAM: mitmproxy
             REPO: mitmproxy/mitmproxy
-            # Latest commit on the mitmproxy main branch, as of Jan 02, 2026.
-            REF: e6aa924bb411a9687b91920b8d094af37bc02b90
+            # Latest commit on the mitmproxy main branch, as of Jan 12, 2026.
+            REF: a7621021191011de7c95771459688de3ecd67c10
             PATH: mitmproxy
           - DOWNSTREAM: scapy
             REPO: secdev/scapy
-            # Latest commit on the scapy master branch, as of Jan 07, 2026.
-            REF: a5bc2bbf9a13f4681f8eda830b167a14bef0b6b9
+            # Latest commit on the scapy master branch, as of Jan 12, 2026.
+            REF: f303033267c828a846b5ee645d5fc2a43a927709
             PATH: scapy
           - DOWNSTREAM: sigstore-python
             REPO: sigstore/sigstore-python