Chore/update libp2p branch master

[kaiserd]

changes the default branch of libp2p from unstable to master.
See vacp2p/nim-libp2p#1088

[tersec]

• should target unstable branch of nimbus-eth2
• it looks like all the non-gitmodule changes are artifacts of this

[github-actions]

Unit Test Results

         9 files  ±0    1 322 suites  ±0   37m 13s ⏱️ -39s
  4 981 tests ±0    4 633 ✔️ ±0  348 💤 ±0  0 ❌ ±0 
20 826 runs  ±0  20 422 ✔️ ±0  404 💤 ±0  0 ❌ ±0 

Results for commit 7d547bd. ± Comparison against base commit 1ab6f16.

♻️ This comment has been updated with latest results.

[kaiserd]

Oh sorry, I missed that. Fixed.

[tersec]

Lint failure is

Run while read -r file; do
Submodule 'vendor/nim-libp2p': '2b5319622c997ce1c80bc62c863e30f3349ee0d7' (2024-04-25 13:01:29 +0000) is more recent than latest 'master' (2023-12-18 18:04:02 +0000) (branch config: '.gitmodules')
Error: Process completed with exit code 2.

This is triggered by

nimbus-eth2/.github/workflows/ci.yml

Lines 293 to 297 in 1ab6f16

	branch_commit_date=$(TZ=UTC0 git -C "$file" show -s --format='%cd' --date=iso-local "refs/remotes/origin/${branch}")
	if [[ "${commit_date}" > "${branch_commit_date}" ]]; then
	echo "Submodule '$file': '$commit' ($commit_date) is more recent than latest '$branch' ($branch_commit_date) (branch config: '.gitmodules')"
	exit 2
	fi

Need to update nim-libp2p submodule itself along with this, in vendor/, because right now it's pointing to/commithash-pinned to https://github.com/vacp2p/nim-libp2p/tree/2b5319622c997ce1c80bc62c863e30f3349ee0d7 from 5 days ago where in the version of libp2p vendored it's still part of the unstable branch from which it was renamed:

commit 2b5319622c997ce1c80bc62c863e30f3349ee0d7 (grafted, HEAD, origin/unstable, origin/HEAD, unstable)
Author: Diego <diego@status.im>
Date:   Thu Apr 25 15:01:29 2024 +0200

    Revert "always allow new data be received if the recvWindow is > 0"
    
    This reverts commit 5cbb473d1b765307ee15c73f47e180ae3a81fdb3.

whereas as it notes, the most recent master commit before the recent libp2p branch reorganization was from last year. So this change and the module update/bump need to happen mutually/internally consistently.

[etan-status]

This is not pointing to the default branch, but instead to the one that should be used for building. If we should no longer use unstable version of libp2p, have to checkout a different ref

[tersec]

That was the intent; the vacuous bump there now enforces/ensures this gets picked up by git. libp2p is switching from unstable to master for this purpose. Before master hadn't been updating enough to make it worthwhile; now it will.

[kaiserd]

I added an empty commit to libp2p and did a dummy-bump in the latest commit of this PR.
This allowed pleasing the linter.