fix(deps): update module github.com/twmb/franz-go/pkg/kadm to v1.18.0

| datasource | package                           | from    | to      |
| ---------- | --------------------------------- | ------- | ------- |
| go         | github.com/twmb/franz-go/pkg/kadm | v1.17.2 | v1.18.0 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

go.mod

@@ -131,8 +131,8 @@ require (
 	github.com/shirou/gopsutil/v4 v4.26.3
 	github.com/thanos-io/objstore v0.0.0-20250115091151-a54d0f04b42a
 	github.com/tjhop/slog-gokit v0.2.0
-	github.com/twmb/franz-go v1.20.7
-	github.com/twmb/franz-go/pkg/kadm v1.17.2
+	github.com/twmb/franz-go v1.21.0
+	github.com/twmb/franz-go/pkg/kadm v1.18.0
 	github.com/twmb/franz-go/pkg/kfake v0.0.0-20250603004440-37eecbb8927f
 	github.com/twmb/franz-go/pkg/kmsg v1.13.1
 	github.com/twmb/franz-go/plugin/kotel v1.6.0

go.sum

@@ -967,10 +967,10 @@ github.com/tklauser/numcpus v0.11.0 h1:nSTwhKH5e1dMNsCdVBukSZrURJRoHbSEQjdEbY+9R
 github.com/tklauser/numcpus v0.11.0/go.mod h1:z+LwcLq54uWZTX0u/bGobaV34u6V7KNlTZejzM6/3MQ=
 github.com/ttacon/chalk v0.0.0-20160626202418-22c06c80ed31/go.mod h1:onvgF043R+lC5RZ8IT9rBXDaEDnpnw/Cl+HFiw+v/7Q=
 github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqriFuLhtthL60Sar/7RFoluCcXsuvEwTV5KM=
-github.com/twmb/franz-go v1.20.7 h1:P4MGSXJjjAPP3NRGPCks/Lrq+j+twWMVl1qYCVgNmWY=
-github.com/twmb/franz-go v1.20.7/go.mod h1:0bRX9HZVaoueqFWhPZNi2ODnJL7DNa6mK0HeCrC2bNU=
-github.com/twmb/franz-go/pkg/kadm v1.17.2 h1:g5f1sAxnTkYC6G96pV5u715HWhxd66hWaDZUAQ8xHY8=
-github.com/twmb/franz-go/pkg/kadm v1.17.2/go.mod h1:ST55zUB+sUS+0y+GcKY/Tf1XxgVilaFpB9I19UubLmU=
+github.com/twmb/franz-go v1.21.0 h1:J3uB/poWgHD6VIilER2uCPFAZHDRXVFT+11pBgRKod4=
+github.com/twmb/franz-go v1.21.0/go.mod h1:1o+jj5oRbItsIMoE+DGpfJIcPcPtDdtkcNFPj4bWNwU=
+github.com/twmb/franz-go/pkg/kadm v1.18.0 h1:WRf/LZmDdcDXwX7WMbtDU++v+b3NzYh2bCGoPMmzirw=
+github.com/twmb/franz-go/pkg/kadm v1.18.0/go.mod h1:XeLhGoLXLFzK8/ryv5FfpxPxGwj4oFEGpPJMB/x6KDE=
 github.com/twmb/franz-go/pkg/kfake v0.0.0-20250603004440-37eecbb8927f h1:69/xwCyhBOKyMaPISOxdmfhxVZZ/WEwurPZKUw3yRrc=
 github.com/twmb/franz-go/pkg/kfake v0.0.0-20250603004440-37eecbb8927f/go.mod h1:udxwmMC3r4xqjwrSrMi8p9jpqMDNpC2YwexpDSUmQtw=
 github.com/twmb/franz-go/pkg/kmsg v1.13.1 h1:fG5kItwysTk5UXqVwb64EpQEy3TydF3vYYK21nUQ+bI=