chore(deps) Update mcr.microsoft.com/dotnet/sdk Docker tag to v9

Author: renovate[bot]

.gitlab-ci.yml

@@ -13,7 +13,7 @@ stages:
   - publish
 
 precommit:
-  image: mcr.microsoft.com/dotnet/sdk:8.0-alpine
+  image: mcr.microsoft.com/dotnet/sdk:9.0-alpine
   stage: test
   except:
     - public
@@ -40,7 +40,7 @@ precommit:
     - pre-commit run stylelint --all-files
 
 build_web:
-  image: mcr.microsoft.com/dotnet/sdk:8.0-alpine
+  image: mcr.microsoft.com/dotnet/sdk:9.0-alpine
   stage: build
   except:
     - public

Dockerfile

@@ -10,7 +10,7 @@
 # to access webapp
 # http://localhost:1234
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine AS build
 ENV DOTNET_CLI_TELEMETRY_OPTOUT=1
 
 WORKDIR /app
@@ -43,7 +43,7 @@ RUN  export PATH="$PATH:/root/.dotnet/tools" && dotnet ef database update --proj
 
 RUN dotnet publish -c Release -o out web.csproj
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine
+FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine
 ENV DOTNET_CLI_TELEMETRY_OPTOUT=1
 WORKDIR /app
 COPY --from=build ["/app/web/out", "./"]