chore: Major dependency updates (#274)

## About this PR
Updates:

* 📦 [com.zaxxer:HikariCP](https://github.com/brettwooldridge/HikariCP)
from `5.1.0` to `6.0.0` ⚠

## Usage
✅ **Please merge!**

I'll automatically update this PR to resolve conflicts as long as you
don't change it yourself.

If you have any feedback, just mention me in the comments below.

Configure Scala Steward for your repository with a
[`.scala-steward.conf`](https://github.com/scala-steward-org/scala-steward/blob/767fcfecbfd53c507152f6cf15c846176bae561d/docs/repo-specific-configuration.md)
file.

_Have a fantastic day writing Scala!_

<details>
<summary>⚙ Adjust future updates</summary>

Add these to your `.scala-steward.conf` file to ignore future updates of
these dependencies:
```
updates.ignore = [
  { groupId = "com.zaxxer", artifactId = "HikariCP" }
]
```
Or, add these to slow down future updates of these dependencies:
```
dependencyOverrides = [
  {
    pullRequests = { frequency = "30 days" },
    dependency = { groupId = "com.zaxxer", artifactId = "HikariCP" }
  }
]
```
</details>

<sup>
labels: library-update, early-semver-major, semver-spec-major,
commit-count:1
</sup>

Co-authored-by: Christian Kleinbölting <[email protected]>

build.sbt

@@ -9,7 +9,7 @@ addCommandAlias("headerCreateAll", "; all root/headerCreate Test/headerCreate")
 addCommandAlias("headerCheckAll", "; all root/headerCheck Test/headerCheck")
 
 val flywayVersion               = "10.18.2"
-val hikariVersion               = "5.1.0"
+val hikariVersion               = "6.0.0"
 val quillVersion                = "4.8.5"
 val sipiVersion                 = "v30.18.3"
 val sqliteVersion               = "3.46.1.3"