chore: bump kagent tools to 0.2.1 (#1995)

- Bump kagent tools to `0.2.1` which includes a change that mounts an
empty `tmp` volume to the tools container to enable write operations to
be unimpeded by pod's securityContext.readOnlyRootFileSystem set to be
true.

Signed-off-by: JM Huibonhoa <jm.huibonhoa@solo.io>

Author: jmhbh

helm/kagent/Chart-template.yaml

@@ -9,7 +9,7 @@ dependencies:
     repository: oci://ghcr.io/kagent-dev/kmcp/helm
     condition: kmcp.enabled
   - name: kagent-tools
-    version: 0.1.3
+    version: 0.2.1
     repository: oci://ghcr.io/kagent-dev/tools/helm
     condition: kagent-tools.enabled
   - name: grafana-mcp