feat(graphicsfuzz-spirv): Migrate graphicsfuzz-spirv to Ubuntu 24.04 (#14237)

### Summary

This pull request migrates the `graphicsfuzz-spirv` project to use the
new `ubuntu-24-04` base image for fuzzing. This makes it one of the
first pilot projects to be migrated to the new, modernized build
environment.

### Motivation

As part of the broader OSS-Fuzz initiative to keep our build
environments up-to-date, we are gradually migrating projects to newer
base operating systems. This provides projects with access to more
recent compilers, updated libraries (e.g., libc), and modern tooling,
which can lead to better bug detection and overall fuzzer stability.

### Changes in this PR

This migration involves three key changes:

1. **`projects/graphicsfuzz-spirv/project.yaml`**: Sets the
`base_os_version` property to `ubuntu-24-04`, officially opting the
project into the new base image.
2. **`projects/graphicsfuzz-spirv/Dockerfile`**: Updates the `FROM`
instruction to pull the corresponding
`gcr.io/oss-fuzz-base/base-builder:ubuntu-24-04` image. This ensures the
project's build environment aligns with the specified OS version.

### Verification

All CI checks. The project has also been confirmed to build successfully
with the new base image.

Author: hunsche

projects/graphicsfuzz-spirv/Dockerfile

@@ -14,7 +14,7 @@
 #
 ################################################################################
 
-FROM gcr.io/oss-fuzz-base/base-builder
+FROM gcr.io/oss-fuzz-base/base-builder:ubuntu-24-04
 RUN apt-get update && apt-get install -y cmake ninja-build
 
 RUN mkdir -p graphicsfuzz-spirv

projects/graphicsfuzz-spirv/project.yaml

@@ -1,4 +1,5 @@
 homepage: "https://www.graphicsfuzz.com"
+base_os_version: ubuntu-24-04
 language: c++
 main_repo: "https://github.com/google/graphicsfuzz"
 primary_contact: "afdx@google.com"