test(deps): update dependency dotnet to v9

Author: renovate[bot]

Diff for: test/Dockerfile.distro

@@ -60,7 +60,7 @@ RUN install-tool devbox 0.14.0
 RUN install-tool docker v28.0.1
 
 # renovate: datasource=dotnet packageName=dotnet-sdk
-RUN install-tool dotnet 8.0.406
+RUN install-tool dotnet 9.0.200
 
 # renovate: datasource=github-releases packageName=containerbase/flutter-prebuild
 RUN install-tool flutter 3.27.4

Diff for: test/dotnet/Dockerfile

@@ -70,11 +70,11 @@ RUN set -ex;  \
 FROM base AS testb
 
 # renovate: datasource=dotnet packageName=dotnet-sdk
-RUN install-tool dotnet 8.0.406
+RUN install-tool dotnet 9.0.200
 
 # Test duplicate install
 # renovate: datasource=dotnet packageName=dotnet-sdk
-RUN install-tool dotnet 8.0.406
+RUN install-tool dotnet 9.0.200
 RUN set -ex; dotnet --version | grep 8.0.
 
 USER 12021
@@ -101,7 +101,7 @@ RUN set -ex; \
 
 # only patch updates
 # renovate: datasource=dotnet packageName=dotnet-sdk
-RUN install-tool dotnet 8.0.406
+RUN install-tool dotnet 9.0.200
 RUN set -ex; dotnet --version | grep 8.0.
 
 RUN set -ex; \

Diff for: test/dotnet/Dockerfile.arm64

@@ -38,7 +38,7 @@ ARG CONTAINERBASE_LOG_LEVEL
 FROM base AS test-dotnet
 
 # renovate: datasource=dotnet packageName=dotnet-sdk
-RUN install-tool dotnet 8.0.406
+RUN install-tool dotnet 9.0.200
 
 #--------------------------------------
 # Image: final