Bump Bullseye, SimpleExec and System.Text.Json

Bumps Bullseye from 4.2.1 to 6.0.0
Bumps SimpleExec from 11.0.0 to 12.0.0
Bumps System.Text.Json from 9.0.2 to 9.0.6

---
updated-dependencies:
- dependency-name: Bullseye
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: SimpleExec
  dependency-version: 12.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: System.Text.Json
  dependency-version: 9.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "gitversion.tool": {
-      "version": "5.12.0",
+      "version": "6.3.0",
       "commands": [
         "dotnet-gitversion"
       ]

build/build.csproj

@@ -6,10 +6,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Bullseye" Version="4.2.1" />
+    <PackageReference Include="Bullseye" Version="6.0.0" />
     <PackageReference Include="Glob" Version="1.1.9" />
-    <PackageReference Include="SimpleExec" Version="11.0.0" />
-    <PackageReference Include="System.Text.Json" Version="9.0.2" />
+    <PackageReference Include="SimpleExec" Version="12.0.0" />
+    <PackageReference Include="System.Text.Json" Version="9.0.6" />
   </ItemGroup>
 
 </Project>