Update RUNNER_IMAGES_VERSION to 0.0.48

Bumps the runner base images from v0.0.47 to v0.0.48.

Changes included in base-images v0.0.48:

• Update dependency git-for-windows/git to v2.55.0.windows.3 gitlab-org/ci-cd/runner-tools/base-images!155 (merged)
• Update dependency golang-fips/go to v1.26.5 gitlab-org/ci-cd/runner-tools/base-images!154 (merged)
• Update dependency gitlab-com/gl-infra/common-ci-tasks to v4.30 gitlab-org/ci-cd/runner-tools/base-images!153 (merged)
• Update debian Docker tag to bookworm-20260713 gitlab-org/ci-cd/runner-tools/base-images!152 (merged)
• Strip CR from Git for Windows checksums in update-checksums.sh gitlab-org/ci-cd/runner-tools/base-images!156 (merged)
• Fix Git for Windows checksum update for rebuild (.windows.N) releases gitlab-org/ci-cd/runner-tools/base-images!149 (merged)