feat: reduce the routing table refresh period

[rach-id]

Overview

Reduces the routing table refresh period to a more realistic period. The value is taken from Celestia-node repo.

For IPFS, the value is 10 minutes:

To keep the routing tables accurate and up to date, IPFS refreshes the routing table every 10 minutes. While this is likely a higher frequency than is strictly necessary, it's important to protect the network's health as IPFS learns more about the dynamics of the DHT network. A routing table refresh works as follows:

source: https://docs.ipfs.tech/concepts/dht/#routing-tables

I guess 1 minute is a good value given that our P2P network is still new and experimental.
We can reduce that to even 1 hour once we have enough validators running orchestrators.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #140 (b0a8941) into main (27f6375) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #140   +/-   ##
=======================================
  Coverage   45.90%   45.90%           
=======================================
  Files          15       15           
  Lines         952      952           
=======================================
  Hits          437      437           
  Misses        466      466           
  Partials       49       49           

Impacted Files	Coverage Δ
p2p/dht.go	61.81% <100.00%> (ø)

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