Bazel: Remove unused commons-codec dependency

Commit I033936936b removed the usage of commons-codec, but the Bazel
definition in external_plugin_deps.bzl was left behind.

Remove the stale maven_jar and the omit_commons_codec flag.

Change-Id: I94ab423bd0ffe2b7d3cb9d3ad1c119c309368aa6

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 9c97be9..a5c7e06 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -16,4 +16,4 @@
 
 load(":external_plugin_deps.bzl", "external_plugin_deps")
 
-external_plugin_deps(omit_commons_codec = False)
+external_plugin_deps()

external_plugin_deps.bzl

diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 0025bad..76d6c7f 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -1,6 +1,6 @@
 load("//tools/bzl:maven_jar.bzl", "maven_jar")
 
-def external_plugin_deps(omit_commons_codec = True):
+def external_plugin_deps():
     JACKSON_VERS = "2.10.2"
     SCRIBEJAVA_VERS = "6.9.0"
     SAP_SECURITY_VERS = "3.6.0"
@@ -57,9 +57,3 @@
         artifact = "org.json:json:20250517",
         sha1 = "d67181bbd819ccceb929b580a4e2fcb0c8b17cd8",
     )
-    if not omit_commons_codec:
-        maven_jar(
-            name = "commons-codec",
-            artifact = "commons-codec:commons-codec:1.4",
-            sha1 = "4216af16d38465bbab0f3dff8efa14204f7a399a",
-        )