bazel: update seastar

To tip of 25.3.x-pre: f7a712e9b3, brings in the following changes:

f7a712e9b disable exception interception when ASAN enabled
669874f2c Merge pull request #223 from redpanda-data/stephan/down-stream-iotune-io-queue
548c9c162 remove inadvertent BUILD, MODULE file checkin
26e1614ee Fix incorrect defaults for io queue iops/bandwidth
5e56a6afc Fix hang in io_queue for big write ioproperties numbers

CORE-5571.

Author: travisdowns

bazel/repositories.bzl

@@ -162,9 +162,9 @@ def data_dependency():
     http_archive(
         name = "seastar",
         build_file = "//bazel/thirdparty:seastar.BUILD",
-        sha256 = "4665a3f117c47e830e819e7b1184ace9f701d20487817f0c46e124b7b62750ba",
-        strip_prefix = "seastar-737485d4e702a447c310e804cc9bfc57cb7c60cf",
-        url = "https://github.com/redpanda-data/seastar/archive/737485d4e702a447c310e804cc9bfc57cb7c60cf.tar.gz",
+        sha256 = "616e419ed198b33a0907ab555e62bbba115e2aaebb72eda9a661f6a70b5a2a59",
+        strip_prefix = "seastar-f7a712e9b3bace919f50f52c4b5b3ff0079900fa",
+        url = "https://github.com/redpanda-data/seastar/archive/f7a712e9b3bace919f50f52c4b5b3ff0079900fa.tar.gz",
     )
 
     http_archive(