Bump EPPlus from 8.2.1 to 8.4.1

---
updated-dependencies:
- dependency-name: EPPlus
  dependency-version: 8.4.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

xlwrite/xlwrite.csproj

@@ -1,19 +1,19 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net9.0</TargetFramework>
-    <Nullable>enable</Nullable>
-    <LangVersion>latestmajor</LangVersion>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <Optimize>false</Optimize>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="Antlr4.Runtime.Standard" Version="4.13.1" />
-    <PackageReference Include="EPPlus" Version="8.2.1" />
-  </ItemGroup>
-
-</Project>
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <LangVersion>latestmajor</LangVersion>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <Optimize>false</Optimize>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Antlr4.Runtime.Standard" Version="4.13.1" />
+    <PackageReference Include="EPPlus" Version="8.4.1" />
+  </ItemGroup>
+
+</Project>