build(deps): bump ubuntu in /ci/builder

Bumps ubuntu from lunar-20230731 to lunar-20231128.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ci/builder/Dockerfile

@@ -10,7 +10,7 @@
 # Build a cross-compiling toolchain that targets the oldest version of Linux
 # that we support.
 
-FROM ubuntu:lunar-20230731 as crosstool
+FROM ubuntu:lunar-20231128 as crosstool
 ARG ARCH_GCC
 ARG ARCH_GO
 
@@ -68,7 +68,7 @@ RUN DEFCONFIG=crosstool-$ARCH_GCC.defconfig ct-ng defconfig \
 # Import the cross-compiling toolchain into a fresh image, omitting the
 # dependencies that we needed to actually build the toolchain.
 
-FROM ubuntu:lunar-20230731
+FROM ubuntu:lunar-20231128
 ARG ARCH_GCC
 ARG ARCH_GO