Bump version to 4.4.6 to address CVE-2026-42507 (#383)

- Updated plugin version from 4.4.5 to 4.4.6
- Addresses CVE-2026-42507 (medium severity) in net/textproto
- Requires Go 1.26.4 for complete fix
- Also addresses 15 other Go standard library vulnerabilities

Signed-off-by: areddy548 <areddy548@github.com>
Co-authored-by: areddy548 <areddy548@github.com>

Author: areddy548

plugin.json

@@ -28,5 +28,5 @@
     "scope": [
         "Execution"
     ],
-    "version": "4.4.5"
+    "version": "4.4.6"
 }