Bump dotnet

This commit fixes the CI error on `main` branch where
amqp_system_SUITE failed with the following error:
```
Process terminated. Couldn't find a valid ICU package installed on the system. Set the configuration flag System.Globalization.Invariant to true if you want to run with no globalization support.
   at System.Environment.FailFast(System.String)
   at System.Globalization.GlobalizationMode.GetGlobalizationInvariantMode()
   at System.Globalization.GlobalizationMode..cctor()
   at System.Globalization.CultureData.CreateCultureWithInvariantData()
   at System.Globalization.CultureData.get_Invariant()
   at System.Globalization.CultureInfo..cctor()
   at System.String.ToLowerInvariant()
   at Microsoft.DotNet.PlatformAbstractions.RuntimeEnvironment.GetArch()
   at Microsoft.DotNet.PlatformAbstractions.RuntimeEnvironment..cctor()
   at Microsoft.DotNet.PlatformAbstractions.RuntimeEnvironment.GetRuntimeIdentifier()
   at Microsoft.DotNet.Cli.MulticoreJitProfilePathCalculator.CalculateProfileRootPath()
   at Microsoft.DotNet.Cli.MulticoreJitActivator.StartCliProfileOptimization()
   at Microsoft.DotNet.Cli.MulticoreJitActivator.TryActivateMulticoreJit()
   at Microsoft.DotNet.Cli.Program.Main(System.String[])

Exit code: 134 (pid <0.1533.0>)
```

(cherry picked from commit 8c0cd1b)

# Conflicts:
#	.github/workflows/test-make-target.yaml

Author: ansd

.github/workflows/test-make-target.yaml

@@ -0,0 +1,81 @@
+name: Test target (make)
+on:
+  workflow_call:
+    inputs:
+      erlang_version:
+        required: true
+        type: string
+      elixir_version:
+        required: true
+        type: string
+      metadata_store:
+        required: true
+        type: string
+      make_target:
+        required: true
+        type: string
+      plugin:
+        required: true
+        type: string
+jobs:
+  test:
+    name: ${{ inputs.plugin }} (${{ inputs.make_target }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+    - name: CHECKOUT REPOSITORY
+      uses: actions/checkout@v4
+
+    - name: FETCH TAGS
+      run: git fetch --tags
+
+    - name: SETUP OTP & ELIXIR
+      uses: erlef/[email protected]
+      with:
+        otp-version: ${{ inputs.erlang_version }}
+        elixir-version: ${{ inputs.elixir_version }}
+        hexpm-mirrors: |
+          https://builds.hex.pm
+          https://cdn.jsdelivr.net/hex
+        # This currently only applies to Elixir; and can be safely
+        # restricted to the build jobs to avoid duplication in output.
+        disable_problem_matchers: true
+
+    - name: SETUP DOTNET (rabbit)
+      uses: actions/setup-dotnet@v4
+      if: inputs.plugin == 'rabbit'
+      with:
+        dotnet-version: '8.0'
+
+    - name: SETUP SLAPD (rabbitmq_auth_backend_ldap)
+      if: inputs.plugin == 'rabbitmq_auth_backend_ldap'
+      run: |
+        sudo apt-get update && \
+        sudo apt-get install -y \
+          ldap-utils \
+          slapd
+
+        sudo systemctl is-active --quiet apparmor.service && sudo systemctl stop apparmor.service
+        sudo systemctl disable apparmor.service
+
+    - name: RUN TESTS
+      if: inputs.plugin != 'rabbitmq_cli'
+      run: |
+        make -C deps/${{ inputs.plugin }} ${{ inputs.make_target }} RABBITMQ_METADATA_STORE=${{ inputs.metadata_store }}
+
+    # rabbitmq_cli needs a correct broker version for two of its tests.
+    # But setting PROJECT_VERSION makes other plugins fail.
+    - name: RUN TESTS (rabbitmq_cli)
+      if: inputs.plugin == 'rabbitmq_cli'
+      run: |
+        make -C deps/${{ inputs.plugin }} ${{ inputs.make_target }} RABBITMQ_METADATA_STORE=${{ inputs.metadata_store }} PROJECT_VERSION="4.1.0"
+
+    - name: UPLOAD TEST LOGS
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: CT logs (${{ inputs.plugin }} ${{ inputs.make_target }} OTP-${{ inputs.erlang_version }} ${{ inputs.metadata_store }})
+        path: |
+          logs/
+          !logs/**/log_private
+        if-no-files-found: ignore

.github/workflows/test-plugin.yaml

@@ -75,7 +75,7 @@ jobs:
     - uses: actions/setup-dotnet@v4
       if: inputs.plugin == 'rabbit'
       with:
-        dotnet-version: '3.1.x'
+        dotnet-version: '8.0'
     - name: deps/amqp10_client SETUP
       if: inputs.plugin == 'amqp10_client'
       run: |

deps/rabbit/test/amqp_system_SUITE_data/fsharp-tests/global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "3.1"
+    "version": "8.0"
   }
 }