chore(deps): update dependency slather to v2.8.3 (#388)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [slather](https://togithub.com/SlatherOrg/slather) | `2.8.2` -> `2.8.3` | [![age](https://developer.mend.io/api/mc/badges/age/rubygems/slather/2.8.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/rubygems/slather/2.8.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/rubygems/slather/2.8.2/2.8.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/rubygems/slather/2.8.2/2.8.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>SlatherOrg/slather (slather)</summary>

### [`v2.8.3`](https://togithub.com/SlatherOrg/slather/blob/HEAD/CHANGELOG.md#v283)

[Compare Source](https://togithub.com/SlatherOrg/slather/compare/v2.8.2...v2.8.3)

-   Fix coverage_file.source_file_pathname
    [alfredofernandes](https://togithub.com/alfredofernandes)
    [#&#8203;565](https://togithub.com/SlatherOrg/slather/pull/565)

-   update cobertura DTD to a working URL.
    [jarrodlombardo-EventBase](https://togithub.com/jarrodlombardo-EventBase)
    [#&#8203;564](https://togithub.com/SlatherOrg/slather/pull/564)

</details>

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Gemfile.lock

@@ -97,7 +97,7 @@ GEM
     nap (1.1.0)
     netrc (0.11.0)
     nkf (0.2.0)
-    nokogiri (1.16.6)
+    nokogiri (1.16.7)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     open4 (1.3.4)
@@ -110,7 +110,7 @@ GEM
     ruby-macho (2.5.1)
     sassc (2.4.0)
       ffi (~> 1.9)
-    slather (2.8.2)
+    slather (2.8.3)
       CFPropertyList (>= 2.2, < 4)
       activesupport
       clamp (~> 1.3)