Bump dotnet/sdk in /docker

Bumps dotnet/sdk from 9.0.303-bookworm-slim to 9.0.308-bookworm-slim.

---
updated-dependencies:
- dependency-name: dotnet/sdk
  dependency-version: 9.0.308-bookworm-slim
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docker/alpine.dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:9.0.303-alpine3.21@sha256:2fe880002c458a6e95a3f8bb38b63c0f2e21ffefcb01c0223c4408cc91ad7d9d
+FROM mcr.microsoft.com/dotnet/sdk:9.0.308-alpine3.21@sha256:28bd5605c0592f5bba90670ccd9af1af2c41c9fb0fbe4e666106791c94d8b60f
 RUN apk update \
     && apk upgrade \
     && apk add --no-cache --update \

docker/debian-arm64.dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:9.0.303-bookworm-slim@sha256:86fe223b90220ec8607652914b1d7dc56fc8ff422ca1240bb81e54c4b06509e6
+FROM mcr.microsoft.com/dotnet/sdk:9.0.308-bookworm-slim@sha256:584cdb686f8ff7d2ffd636581b9bba8c9de38df1e751e9275438cddecdfbbcd2
 
 RUN apt-get update && \
     apt-get install -y \

docker/debian.dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:9.0.303-bookworm-slim@sha256:86fe223b90220ec8607652914b1d7dc56fc8ff422ca1240bb81e54c4b06509e6
+FROM mcr.microsoft.com/dotnet/sdk:9.0.308-bookworm-slim@sha256:584cdb686f8ff7d2ffd636581b9bba8c9de38df1e751e9275438cddecdfbbcd2
 
 RUN wget https://packages.microsoft.com/config/debian/12/packages-microsoft-prod.deb -O packages-microsoft-prod.deb && \
     dpkg -i packages-microsoft-prod.deb && \