Bump gcc from 15 to 16

Bumps gcc from 15 to 16.

---
updated-dependencies:
- dependency-name: gcc
  dependency-version: '16'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -1,7 +1,7 @@
 FROM rust:1.95-bookworm as builder-gifski
 RUN cargo install --version 1.32.0 gifski
 
-FROM gcc:15 as builder-lottie-to-png
+FROM gcc:16 as builder-lottie-to-png
 RUN apt update && \
     apt install --assume-yes cmake python3 python3-pip && \
     rm -rf /var/lib/apt/lists/*