upgrade go version to 1.18

[maha-hajja]

Description

upgrade go version from 1.17 to 1.18

Fixes #353

Note:
golanci-lint doesn't support go1.18 yet, check golangci/golangci-lint#2649
check golangci/golangci-lint#2438 to see which inters will be inactive.

Quick checks:

• I have followed the Code Guidelines.
• There is no other pull request for the same update/change.
• I have written unit tests.
• I have made sure that the PR is of reasonable size and can be easily reviewed.

[lovromazgon]

Looks like a bunch of linters don't work with Go 1.18 yet :/
We should keep an eye on this issue and update golangci-lint once it's resolved golangci/golangci-lint#2649

WARN [linters context] bodyclose is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] gosimple is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] noctx is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] rowserrcheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] sqlclosecheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] staticcheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] structcheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] stylecheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] wastedassign is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] unused is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.

EDIT: Of course I didn't read the PR message, looks like @maha-hajja already pointed it out.