Add version option for upgrade

[crowlKats]

This would close #5146.
It isnt exactly complete yet:

• there should be a check if the version passed is equal to the current version
• right now the output is:

$ ./target/debug/deno upgrade --dry-run --version v0.42.0
Checking for latest version
Invalid semver passed

The checking for latest version should only happen if version is not passed

[crowlKats]

now the previous listed missing features have been implemented

[ry]

This feature is welcome - thanks. Can you add a test tho? I think you can base it on this test:

deno/cli/tests/integration_tests.rs

Lines 203 to 225 in 4e5e6da

	// Warning: this test requires internet access.
	#[test]
	fn upgrade_in_tmpdir() {
	let temp_dir = TempDir::new().unwrap();
	let exe_path = if cfg!(windows) {
	temp_dir.path().join("deno")
	} else {
	temp_dir.path().join("deno.exe")
	};
	let _ = std::fs::copy(util::deno_exe_path(), &exe_path).unwrap();
	assert!(exe_path.exists());
	let _mtime1 = std::fs::metadata(&exe_path).unwrap().modified().unwrap();
	let status = Command::new(&exe_path)
	.arg("upgrade")
	.arg("--force")
	.spawn()
	.unwrap()
	.wait()
	.unwrap();
	assert!(status.success());
	let _mtime2 = std::fs::metadata(&exe_path).unwrap().modified().unwrap();
	// TODO(ry) assert!(mtime1 < mtime2);
	}

[crowlKats]

@ry will this suffice?

[ry]

LGTM - nice patch!