fix(deps): update module github.com/kcp-dev/kcp/sdk to v0.28.3

Author: renovate[bot]

go.mod

@@ -39,7 +39,7 @@ replace (
 
 require (
 	github.com/go-logr/logr v1.4.3
-	github.com/kcp-dev/kcp/sdk v0.28.1-0.20250915073746-2b42b96efc54
+	github.com/kcp-dev/kcp/sdk v0.28.3
 	github.com/kcp-dev/logicalcluster/v3 v3.0.5
 	github.com/openfga/api/proto v0.0.0-20250909173124-0ac19aac54f2
 	github.com/openfga/language/pkg/go v0.2.0-beta.2.0.20250428093642-7aeebe78bbfe

go.sum

@@ -109,8 +109,8 @@ github.com/kcp-dev/apimachinery/v2 v2.0.1-0.20250728122101-adbf20db3e51 h1:l38RD
 github.com/kcp-dev/apimachinery/v2 v2.0.1-0.20250728122101-adbf20db3e51/go.mod h1:rF1jfvUfPjFXs+HV/LN1BtPzAz1bfjJOwVa+hAVfroQ=
 github.com/kcp-dev/controller-runtime v0.19.0-kcp.1 h1:mbCyVzWuJpg+pkzIkIKLltiOgOSiQ3bqWmHi2mftzgc=
 github.com/kcp-dev/controller-runtime v0.19.0-kcp.1/go.mod h1:jwK5sBnpu/xJJ+xdpSzzI0aM52E/EvF0uLF9bR61h/Y=
-github.com/kcp-dev/kcp/sdk v0.28.1-0.20250915073746-2b42b96efc54 h1:CUfnrqLukdY9a1KbZs0Lh0lzxeWOex5oZ+yEdHziNEs=
-github.com/kcp-dev/kcp/sdk v0.28.1-0.20250915073746-2b42b96efc54/go.mod h1:aC2BPGPvy8QtkI2gQNH9NfW6xpfGIKZkR93gy9O02BE=
+github.com/kcp-dev/kcp/sdk v0.28.3 h1:TS2nJOVBjenBd3fz1+y3aNrqZWqmakalNAIcQM9SukQ=
+github.com/kcp-dev/kcp/sdk v0.28.3/go.mod h1:8oZpWxkoMu2TDpx5DgdIGDigByKHKkeqVMA4GiWneoI=
 github.com/kcp-dev/kubernetes/staging/src/k8s.io/api v0.0.0-20250816165010-ffe1d7c8649b h1:CyQuxPfhWg8KdwfmY5aE6KABsh/QhkDXTH2msezxCFY=
 github.com/kcp-dev/kubernetes/staging/src/k8s.io/api v0.0.0-20250816165010-ffe1d7c8649b/go.mod h1:uiagPCm7MlCfQpIm2xwPTRf8727wbCZCMgHI9uHcMpg=
 github.com/kcp-dev/kubernetes/staging/src/k8s.io/apimachinery v0.0.0-20250816165010-ffe1d7c8649b h1:cJfP+GeRW8O1/49MKUoJ6xbiFiMMOEr/DSrt2y9r0hc=