Fix admin sync with no address specified

[gammazero]

The admin sync command causes panic when no address is given. Fixed by avoiding nil multiaddr.

Update go-libp2p to fix timer leak.

Fixes #2388

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (0c74788) 48.06% compared to head (d787d52) 48.19%.

Files	Patch %	Lines
server/admin/handler.go	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2392      +/-   ##
==========================================
+ Coverage   48.06%   48.19%   +0.12%     
==========================================
  Files          82       82              
  Lines        9786     9788       +2     
==========================================
+ Hits         4704     4717      +13     
+ Misses       4548     4539       -9     
+ Partials      534      532       -2     

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[github-actions]

Suggested version: v0.8.8

Comparing to: v0.8.7 (diff)

Changes in go.mod file(s):

(empty)

gorelease says:

# diagnostics
required module github.com/kataras/iris/[email protected] retracted by module author: Retract older versions as only latest is to be depended upon. Please update to @latest
required module github.com/microcosm-cc/[email protected] retracted by module author: Retract older versions as only latest is to be depended upon

# summary
Suggested version: v0.8.8

gocompat says:

Your branch is up to date with 'origin/main'.

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