Add args.SilenceDependencyDeprecations option

Remove safeexec

The vulnerability was addressed by the Go team in 1.19, so the safeexec package is no longer needed.

all: Run modernize -fix ./...

Rebuild proto file with updated protoc-gen-go/protoc

No changes, which is good.

Fix potential deadlock on panic

See #31

Add Args.SilenceDeprecations option

Upgrade to v3 of the protocol

https://github.com/sass/sass/tree/embedded-protocol-3.1.0

Closes #28

Make the ProtocolVersion version more lenient

Namespace the proto packages so we can run both v1 and v2 at the same…

… time

Send interrupt on Close on GOOS != windows

Updates #19