build: Upgrade rules_swift to 3.1.2 and grpc to 1.76.0 (#8909)

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index dc400d1..166bd0d 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -23,7 +23,7 @@
 )
 bazel_dep(
     name = "grpc",
-    version = "1.70.1",
+    version = "1.76.0",
     repo_name = "com_github_grpc_grpc",
 )
 bazel_dep(
@@ -49,7 +49,7 @@
 )
 bazel_dep(
     name = "rules_swift",
-    version = "2.1.1",
+    version = "3.1.2",
     max_compatibility_level = 3,
     repo_name = "build_bazel_rules_swift",
 )