Bump rexml from 3.3.7 to 3.3.9 in /examples/stacks/jekyll/myblog #6554

Job	Run time
Test Flake Build	1m 38s
build-devbox (ubuntu-latest)	26s
Spell Check with Typos	6s
golangci-lint (ubuntu-latest)	48s
build-devbox (macos-13)	1m 17s
golangci-lint (macos-13)	3m 12s
auto-nix-install (ubuntu-latest, true)	48s
test-nix-versions (ubuntu-latest, 2.15.1)	44s
auto-nix-install (ubuntu-latest, false)	35s
test-nix-versions (ubuntu-latest, 2.16.1)	44s
auto-nix-install (macos-13, true)	2m 53s
test (not-main, ubuntu-latest, project-tests-only, 2.12.0)	8m 21s
test-nix-versions (ubuntu-latest, 2.17.0)	36s
auto-nix-install (macos-13, false)	3m 35s
test (not-main, ubuntu-latest, project-tests-only, 2.19.2)	8m 24s
test-nix-versions (ubuntu-latest, 2.18.0)	39s
test (not-main, ubuntu-latest, project-tests-only, 2.20.1)	9m 15s
test-nix-versions (ubuntu-latest, 2.19.2)	33s
test (not-main, ubuntu-latest, project-tests-off, 2.12.0)	7m 36s
test-nix-versions (ubuntu-latest, 2.24.7)	41s
test (not-main, ubuntu-latest, project-tests-off, 2.19.2)	9m 9s
test-nix-versions (macos-13, 2.15.1)	2m 26s
test (not-main, ubuntu-latest, project-tests-off, 2.20.1)	8m 19s
test-nix-versions (macos-13, 2.16.1)	2m 45s
test-nix-versions (macos-13, 2.17.0)	2m 33s
test-nix-versions (macos-13, 2.18.0)	2m 18s
test-nix-versions (macos-13, 2.19.2)	2m 10s
test-nix-versions (macos-13, 2.24.7)	3m 0s
	1h 25m 31s

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