Bump EPPlus from 6.2.0 to 6.2.6

Bumps [EPPlus](https://github.com/EPPlusSoftware/EPPlus) from 6.2.0 to 6.2.6.
- [Release notes](https://github.com/EPPlusSoftware/EPPlus/releases)
- [Commits](EPPlusSoftware/EPPlus@v6.2.0...v6.2.6)

---
updated-dependencies:
- dependency-name: EPPlus
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

accounts-api/src/WebApi/WebApi.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
     <TargetFramework>net7.0</TargetFramework>
@@ -21,7 +21,7 @@
 
   <ItemGroup>
     <!-- Microsoft -->
-    <PackageReference Include="EPPlus" Version="6.2.0" />
+    <PackageReference Include="EPPlus" Version="6.2.6" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.0.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>