build(deps): bump github.com/open-policy-agent/opa from 0.51.0 to 0.59.0

Bumps [github.com/open-policy-agent/opa](https://github.com/open-policy-agent/opa) from 0.51.0 to 0.59.0.
- [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/v0.51.0...v0.59.0)

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

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

vendor/github.com/open-policy-agent/opa/topdown/cache/cache.go

@@ -7,11 +7,10 @@ package cache
 
 import (
 	"container/list"
+	"sync"
 
 	"github.com/open-policy-agent/opa/ast"
 
-	"sync"
-
 	"github.com/open-policy-agent/opa/util"
 )
 
@@ -62,6 +61,7 @@ func (c *Config) validateAndInjectDefaults() error {
 // InterQueryCacheValue defines the interface for the data that the inter-query cache holds.
 type InterQueryCacheValue interface {
 	SizeInBytes() int64
+	Clone() (InterQueryCacheValue, error)
 }
 
 // InterQueryCache defines the interface for the inter-query cache.
@@ -70,6 +70,7 @@ type InterQueryCache interface {
 	Insert(key ast.Value, value InterQueryCacheValue) int
 	Delete(key ast.Value)
 	UpdateConfig(config *Config)
+	Clone(value InterQueryCacheValue) (InterQueryCacheValue, error)
 }
 
 // NewInterQueryCache returns a new inter-query cache.
@@ -130,6 +131,12 @@ func (c *cache) UpdateConfig(config *Config) {
 	c.config = config
 }
 
+func (c *cache) Clone(value InterQueryCacheValue) (InterQueryCacheValue, error) {
+	c.mtx.Lock()
+	defer c.mtx.Unlock()
+	return c.unsafeClone(value)
+}
+
 func (c *cache) unsafeInsert(k ast.Value, v InterQueryCacheValue) (dropped int) {
 	size := v.SizeInBytes()
 	limit := c.maxSizeBytes()
@@ -174,6 +181,10 @@ func (c *cache) unsafeDelete(k ast.Value) {
 	c.l.Remove(cacheItem.keyElement)
 }
 
+func (c *cache) unsafeClone(value InterQueryCacheValue) (InterQueryCacheValue, error) {
+	return value.Clone()
+}
+
 func (c *cache) maxSizeBytes() int64 {
 	if c.config == nil {
 		return defaultMaxSizeBytes