Update gitlab.com/gitlab-org/fleeting/fleeting version and other deps

What does this MR do?

This pulls in gitlab-org/fleeting/fleeting!49 (merged) and other Go libraries.

Why was this MR needed?

Some AMIs may only support diffie-hellman-group-exchange-sha256 as an SSH key exchange.

What's the best way to test this MR?

1. See how to install the AWS fleeting plugin: https://docs.gitlab.com/runner/fleet_scaling/fleeting.html#install-a-fleeting-plugin, https://docs.gitlab.com/runner/executors/docker_autoscaler.html
2. I used the config:

[[runners]
 <snip>
 executor = "docker-autoscaler"

  [runners.autoscaler]
  plugin = "aws"

  capacity_per_instance = 1
  max_use_count = 4
  max_instances = 4

    [runners.autoscaler.plugin_config] # plugin specific configuration (see plugin documentation)
    name             = "stanhu-autoscaling-group1"               # AWS Autoscaling Group name
    profile          = "default"                     # optional, default is 'default'

    [runners.autoscaler.connector_config]
      username          = "ubuntu"
      use_external_addr = false

    [[runners.autoscaler.policy]]
      idle_count = 1
      idle_time = "20m0s"

3. I set up an inline policy for my EC2 instance role with the permissions: https://gitlab.com/gitlab-org/fleeting/plugins/aws
4. I created a launch template that used ami-083892fc5e6c5c027 (Ubuntu AMI with Docker) from https://gitlab.com/gitlab-org/ci-cd/runner-tools/grit/-/blob/main/modules/aws/ami_lookup/manifest.json?ref_type=heads.
5. In the launch template data section, I added:

#!/bin/bash
echo "KexAlgorithms diffie-hellman-group-exchange-sha256" >> /etc/ssh/sshd_config
systemctl restart sshd

6. I verified the instance didn't accept any other key exchanges:

ssh -o KexAlgorithms=ecdh-sha2-nistp256 -o IdentitiesOnly=true -i my-creds.pem ubuntu@18.x.x.x
Unable to negotiate with 18.x.x.x port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha256,kex-strict-s-v00@openssh.com

7. With GitLab Runner 17.6.0, I see:

8. With this branch, it works:

What are the relevant issue numbers?