Bump stable to 1.10.8 (#8951)

* parity-version: bump stable to 1.10.8

* Update ropsten.json (#8926)

* Update hardcoded headers (#8925)

* Update kovan.json

Update Kovan to block 7693549

* Update foundation.json

Updated to block #5812225

* Update ropsten.json

Update to 3465217

* Update ropsten.json

use tabs

* Update foundation.json

use tabs

* Update kovan.json

use tabs

* scripts: minor improvements (#8930)

* CI: enable 'latest' docker tag on master pipeline

* CI: mark both beta and stable as stable snap.

* CI: sign all windows binaries

* scripts: remove whisper target not available in stable

* Revert "Update hardcoded headers (#8925)"

This reverts commit e1dc5156.

* scripts: fix gitlab strip binaries

* scripts: fix docker build tag on latest using master (#8952)

* rpc: cap gas limit of local calls (#8943)