bump go version to 1.20

[Eoghan1232]

bumping go version to 1.20.
#475 needs a go version greater than 1.17, SRIOV CNI is go 1.20, so updating to stay in line.

all these passed:

make build
make image
go test ./...

[coveralls]

Pull Request Test Coverage Report for Build 5055437967

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.339%

---

Totals
Change from base Build 5046527304:	0.0%
Covered Lines:	1924
Relevant Lines:	2456

---

💛 - Coveralls

[Eoghan1232]

@SchSeba @adrianchiris PTAL

[coveralls]

Pull Request Test Coverage Report for Build 5055400936

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.339%

---

Totals
Change from base Build 5046527304:	0.0%
Covered Lines:	1924
Relevant Lines:	2456

---

💛 - Coveralls