versions: Update firecracker version

This PR updates the firecracker version to v1.6.0 which includes
the following features
- Added support for per net device metrics. In addition to aggregate metrics net, each individual net device will emit metrics under the label "net_{iface_id}". E.g. the associated metrics for the endpoint "/network-interfaces/eth0" will be available under "net_eth0" in the metrics json object.
- Added support for per block device metrics. In addition to aggregate metrics block, each individual block device will emit metrics under the label "block_{drive_id}". E.g. the associated metrics for the endpoint "/drives/{drive_id}" will be available under "block_drive_id" in the metrics json object.
- Added a new vm-state subcommand to info-vmstate command in the snapshot-editor tool to print MicrovmState of vmstate snapshot file in a readable format. Also made the vcpu-states subcommand available on x86_64.
- Added source-level instrumentation based tracing. See tracing for more details.
- Added developer preview only (NOT for production use) support for vhost-user block devices. Firecracker implements a vhost-user frontend. Users are free to choose from existing open source backend solutions or their own implementation. Known limitation: snapshotting is not currently supported for microVMs containing vhost-user block devices. See the related doc page for details. The device emits metrics under the label "vhost_user_{device}_{drive_id}".

Fixes #8854

Signed-off-by: Gabriela Cervantes <gabriela.cervantes.tellez@intel.com>

versions.yaml

@@ -83,7 +83,7 @@ assets:
       uscan-url: >-
         https://github.com/firecracker-microvm/firecracker/tags
         .*/v?(\d\S+)\.tar\.gz
-      version: "v1.4.0"
+      version: "v1.6.0"
 
     qemu:
       description: "VMM that uses KVM"