build(deps): bump github.com/open-policy-agent/opa from 1.12.3 to 1.13.1

Bumps [github.com/open-policy-agent/opa](https://github.com/open-policy-agent/opa) from 1.12.3 to 1.13.1.
- [Release notes](https://github.com/open-policy-agent/opa/releases)
- [Changelog](https://github.com/open-policy-agent/opa/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-policy-agent/opa/compare/v1.12.3...v1.13.1)

---
updated-dependencies:
- dependency-name: github.com/open-policy-agent/opa
  dependency-version: 1.13.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/valyala/fastjson/arena.go

@@ -8,10 +8,10 @@ import (
 //
 // Typical Arena lifecycle:
 //
-//     1) Construct Values via the Arena and Value.Set* calls.
-//     2) Marshal the constructed Values with Value.MarshalTo call.
-//     3) Reset all the constructed Values at once by Arena.Reset call.
-//     4) Go to 1 and re-use the Arena.
+//  1. Construct Values via the Arena and Value.Set* calls.
+//  2. Marshal the constructed Values with Value.MarshalTo call.
+//  3. Reset all the constructed Values at once by Arena.Reset call.
+//  4. Go to 1 and re-use the Arena.
 //
 // It is unsafe calling Arena methods from concurrent goroutines.
 // Use per-goroutine Arenas or ArenaPool instead.

vendor/github.com/valyala/fastjson/doc.go

@@ -4,6 +4,5 @@ Package fastjson provides fast JSON parsing.
 Arbitrary JSON may be parsed by fastjson without the need for creating structs
 or for generating go code. Just parse JSON and get the required fields with
 Get* functions.
-
 */
 package fastjson

vendor/github.com/valyala/fastjson/fuzz.go

@@ -1,3 +1,4 @@
+//go:build gofuzz
 // +build gofuzz
 
 package fastjson

vendor/github.com/valyala/fastjson/pool.go

@@ -48,5 +48,6 @@ func (ap *ArenaPool) Get() *Arena {
 //
 // a and objects created by a cannot be used after a is put into ap.
 func (ap *ArenaPool) Put(a *Arena) {
+	a.Reset()
 	ap.pool.Put(a)
 }

vendor/github.com/valyala/fastjson/update.go

@@ -106,5 +106,8 @@ func (v *Value) SetArrayItem(idx int, value *Value) {
 	for idx >= len(v.a) {
 		v.a = append(v.a, valueNull)
 	}
+	if value == nil {
+		value = valueNull
+	}
 	v.a[idx] = value
 }