🪲 [Fix]: Fix an issue with padding the prerelease number (#42)

## Description

This pull request includes a small change to the `Publish-PSModule`
function in the `scripts/helpers/Publish-PSModule.ps1` file. The change
modifies the way the `latestPrereleaseNumber` is padded with zeros.

*
[`scripts/helpers/Publish-PSModule.ps1`](diffhunk://#diff-780715ac24c6bbe21b54f3d268778136b79f21a62275bbd494dfa857b4ba40d9L278-R278):
Changed the `latestPrereleaseNumber` variable to be explicitly cast to a
string before padding it with zeros.

## Type of change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [ ] 📖 [Docs]
- [x] 🪲 [Fix]
- [ ] 🩹 [Patch]
- [ ] ⚠️ [Security fix]
- [ ] 🚀 [Feature]
- [ ] 🌟 [Breaking change]

## Checklist

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas

Author: MariusStorhaug

scripts/helpers/Publish-PSModule.ps1

@@ -275,7 +275,7 @@ function Publish-PSModule {
 
                 $latestPrereleaseNumber = [Math]::Max($latestPSGalleryPrerelease, $latestGHPrereleases)
                 $latestPrereleaseNumber++
-                $latestPrereleaseNumber = $latestPrereleaseNumber.PadLeft(3,'0')
+                $latestPrereleaseNumber = ([string]$latestPrereleaseNumber).PadLeft(3, '0')
                 $newVersion.Prerelease += $latestPrereleaseNumber
             }
         }