Security fixes

[mojoex]

The latest Cayley release v0.7.7 has multiple security vulnerabilities in its Docker image. This is my first pull request, so I apologise if the process isn't correct. I have branched off of the v0.7.7 release, and if possible, would like a v0.7.8 release created for it. I have no interest in obtaining the latest code from master branches.

This commit resolves those issues by;

• Compiling in Golang 1.19
• Updating packages where required
• Resolving build error in parser.go
• Updating Dockerfile to use 1.19 base image and go install for packr2

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This change is 

[eraserhd]

@mojoex any chance you are still around to update this PR?

[mojoex]

@mojoex any chance you are still around to update this PR?

@eraserhd I'm around, what do you need?