ci: fix go version with quote for release

[FrankYang0529]

Without quote, CI think 1.20 as 1.2.

Ref: https://github.com/harvester/terraform-provider-harvester/actions/runs/7296020228/job/19883228070

[Yu-Jack]

LGTM, interesting

[Yu-Jack]

Add context from https://github.com/actions/setup-go:

Note: Due to the peculiarities of YAML parsing, it is recommended to wrap the version in single quotation marks:

go-version: '1.20'

The recommendation is based on the YAML parser's behavior, which interprets non-wrapped values as numbers and, in the case of version 1.20, trims it down to 1.2, which may not be very obvious. Matching an unstable pre-release: