fix: revert cancel active seal / remove errRecentlySigned

Use heimdall url flag while importing

Bumps [https-proxy-agent](https://github.com/TooTallNate/node-https-proxy-agent) from 2.2.1 to 2.2.4.
- [Release notes](https://github.com/TooTallNate/node-https-proxy-agent/releases)
- [Commits](https://github.com/TooTallNate/node-https-proxy-agent/compare/2.2.1...2.2.4

)

Signed-off-by: dependabot[bot] <support@github.com>

Change tx pool params and gaslimit

* Check validator bytes at first block of sprint

* not required to get parent again

* fix tests

* fix build error

* dev: Fix out-of-turn signing log statement

* dev: Cancel active sealing op when a new chain segment is received

* remove debug statement and return value

* minor: no need to use a channel

* Fix race condition in shouldSeal channel

* Info -> Debug statement

chg: Add GetRootHash to ethClient / use uint64

new: Add bor.getRootHash(start, end) api method (MAT-1302)

MAT-1248: Audit fixes