修复腾讯云因DNS解析生效时间导致无法成功申请证书的bug

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.30 :tada:

Comparison is base (c2129af) 19.02% compared to head (c63e4f3) 19.32%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #240 +/- ## ========================================== + Coverage 19.02% 19.32% +0.30% ========================================== Files 63 63 Lines 4132 4170 +38 ========================================== + Hits 786 806 +20 - Misses 3224 3242 +18 Partials 122 122 ``` | [Impacted Files](https://app.codecov.io/gh/bjdgyc/anylink/pull/240?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bjdgyc) | Coverage Δ | | |---|---|---| | [server/dbdata/cert.go](https://app.codecov.io/gh/bjdgyc/anylink/pull/240?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bjdgyc#diff-c2VydmVyL2RiZGF0YS9jZXJ0Lmdv) | `1.35% <0.00%> (-0.06%)` | :arrow_down: | | [server/dbdata/db.go](https://app.codecov.io/gh/bjdgyc/anylink/pull/240?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bjdgyc#diff-c2VydmVyL2RiZGF0YS9kYi5nbw==) | `6.06% <0.00%> (+0.06%)` | :arrow_up: | ... and [8 files with indirect coverage changes](https://app.codecov.io/gh/bjdgyc/anylink/pull/240/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bjdgyc)

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