[engine-1.21] updating to new signals package in wrangler

[luthermonson]

Proposed Changes

Updates to using wrangler v0.8.8 which includes fixes to the signal handler to give a exported func to cancel the the context by hand. this is useful in windows services and gives us a way to cancel context to kill all sub-processes and exit gracefully when using windows service manager.

Types of Changes

vendor update, small code change to align k3s to use library slight different and pass in context to containerd

Verification

this will ultimately be used in rke2 windows services, this will be tested by QA when we work on closing the linked issue.

Linked Issues

rancher/rke2#1755

User-Facing Change

none

Further Comments

[codecov-commenter]

Codecov Report

Merging #4434 (0ec5bd5) into engine-1.21 (14cf963) will not change coverage.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##           engine-1.21    #4434   +/-   ##
============================================
  Coverage        11.54%   11.54%           
============================================
  Files              133      133           
  Lines             8980     8980           
============================================
  Hits              1037     1037           
  Misses            7718     7718           
  Partials           225      225           

Flag	Coverage Δ
inttests	0.67% <0.00%> (ø)
unittests	11.20% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/agent/containerd/containerd.go	0.00% <0.00%> (ø)
pkg/cli/agent/agent.go	0.00% <0.00%> (ø)
pkg/cli/etcdsnapshot/etcd_snapshot.go	0.00% <0.00%> (ø)
pkg/cli/server/server.go	0.00% <0.00%> (ø)

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[brandond]

Looks good except for DCO!