Update chainsync timeout

[karknu]

Increase the minimum timeout from 90s to 135s and switch from picking from an array of 5 values to a range of timeouts.
This change reduces the risk of synchronosation among nodes in the network.

Description

description of the pull request, if it fixes a particular issue it should link the PR to a particular issue, see ref

Checklist

• Branch
  • Commit sequence broadly makes sense
  • Commits have useful messages
  • The documentation has been properly updated
  • New tests are added if needed and existing tests are updated
  • Any changes affecting Consensus packages must have an entry in the appropriate changelog.d directory created using scriv. If in doubt, see the Consensus release process.
  • Any changes in the Consensus API (every exposed function, type or module) that has changed its name, has been deleted, has been moved, or altered in some other significant way must leave behind a DEPRECATED warning that notifies downstream consumers. If deprecating a whole module, remember to add it to ./scripts/ci/check-stylish.sh as otherwise stylish-haskell would un-deprecate it.
  • If this branch changes Network and has any consequences for downstream repositories or end users, said changes must be documented in interface-CHANGELOG.md
  • If serialization changes, user-facing consequences (e.g. replay from genesis) are confirmed to be intentional.
• Pull Request
  • Self-reviewed the diff
  • Useful pull request description at least containing the following information:
    • What does this PR change?
    • Why these changes were needed?
    • How does this affect downstream repositories and/or end-users?
    • Which ticket does this PR close (if any)? If it does, is it linked?
  • Reviewer requested

[karknu]

I don't have permission to add reviewers but this change should be reviewed by @coot , @njd42 .

[coot]

LGTM

[coot]

bors merge

[iohk-bors]

Build succeeded:

• check-cabal-files
• ci
• Check git dependencies
• Consensus changelog sanity check
• build (9.2.5, windows-latest)
• ci (x86_64-linux)