Fix: check examples depending on lipsum for rust 1.56

[WorldSEnder]

Description

Fixes #2710

As a workaround for the lipsum update not working with our current MSRV, pin it to the previous one.
Targets CI working again.

Checklist

• I have reviewed my own code

[github-actions]

Size Comparison

Details

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
boids	172.945	172.945	0	0.000%
contexts	109.752	109.752	0	0.000%
counter	86.719	86.719	0	0.000%
counter_functional	87.370	87.370	0	0.000%
dyn_create_destroy_apps	89.836	89.836	0	0.000%
file_upload	102.794	102.794	0	0.000%
function_memory_game	167.394	167.394	0	0.000%
function_router	350.514	350.293	-0.221	-0.063%
function_todomvc	162.067	162.067	0	0.000%
futures	227.126	227.126	0	0.000%
game_of_life	107.707	107.707	0	0.000%
inner_html	83.788	83.788	0	0.000%
js_callback	112.968	112.968	0	0.000%
keyed_list	195.264	195.264	0	0.000%
mount_point	86.350	86.350	0	0.000%
nested_list	116.093	116.093	0	0.000%
node_refs	90.539	90.539	0	0.000%
password_strength	1538.629	1538.629	0	0.000%
portals	97.356	97.356	0	0.000%
router	319.478	319.245	-0.232	-0.073%
simple_ssr	153.693	153.693	0	0.000%
ssr_router	395.934	395.686	-0.248	-0.063%
suspense	110.611	110.611	0	0.000%
timer	89.429	89.429	0	0.000%
todomvc	143.127	143.127	0	0.000%
two_apps	87.328	87.328	0	0.000%
web_worker_fib	153.575	153.575	0	0.000%
webgl	87.610	87.610	0	0.000%

✅ None of the examples has changed their size significantly.

[WorldSEnder]

Auto approve didn't run because I initially unintentionally created the PR as draft and it doesn't seem to re-trigger when converting to ready to review.