fix: increase providers validity to 48 hours

[2color]

Description

• chore: remove irrelevant comment
• fix: increase providers validty based on spec as discussed in feat: add reprovide #2785

Notes & open questions

The kad-dht specs says:

Provider Record Republish Interval: The content provider needs to make sure that the nodes chosen to store the provider record are still online when clients ask for the record. In order to guarantee this, while taking into account the peer churn, content providers republish the records they want to provide. Choosing the particular value for the Republish interval is network-specific and depends on several parameters, such as peer reliability and churn.
For the IPFS network it is currently set to 22 hours.

However in our implementation we take a different approach, whereby we run the cleanUp method every 2 hours and only if the record expires in 2 hours do we queue it for a reprovide. This effectively results in a 44 hour Provider Record Republish Interval

js-libp2p/packages/kad-dht/src/reprovider.ts

Lines 150 to 154 in 7c085d1

	if (this.peerId.equals(peerId) && (now - expires) < this.reprovideThreshold) {
	this.queueReprovide(cid)
	.catch(err => {
	this.log.error('could not reprovide %c - %e', cid, err)
	})

Should we increase the REPROVIDE_THRESHOLD from 2 hours to 24 hours?

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works