Fix image example file extension (#698) #4392

Job	Run time
pre-commit / pre-commit	1m 10s
ubuntu / clang-build (ubuntu-24.04-arm)	2m 1s
windows / msvc-build (Release)	2m 1s
mac / clang-build (Debug)	2m 23s
ubuntu / clang-build (ubuntu-24.04)	2m 57s
windows / msvc-build (Debug)	3m 0s
windows / clang-build	1m 59s
mac / clang-build (Release)	2m 2s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	2m 13s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	2m 11s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 18s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 16s
mac / clang-test	5m 7s
windows / msvc-test	5m 12s
windows / clang-test	4m 19s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 17s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 26s
ubuntu / clang-test (ubuntu-24.04)	8m 27s
ubuntu / gcc-test (ubuntu-24.04)	8m 19s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 20s
windows / msvc-test-extended	3m 6s
mac / clang-test-extended	3m 15s
windows / clang-test-extended	3m 2s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 50s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 33s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 33s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 29s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 30s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 21s
ubuntu / gcc-build-codecov	7m 29s
perf / macos-clang-build-perf-stats	2m 29s
perf / ubuntu-gcc-build-perf-stats	1m 27s
pages / build-doxygen-xml	19s
pages / build-scoreboard	15s
pages / build-sphinx	59s
pages / deploy-pages	4m 6s
	2h 7m 41s

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