Increase MSRV to 1.56.1

[ranile]

Description

Fixes the recent breaking in CI. See runs for commit 0bdbd95

Checklist

• I have reviewed my own code
• I have added tests

[github-actions]

Visit the preview URL for this PR (updated for commit 740b9a4):

https://yew-rs--pr2740-msrv-1-56-1-dq1a1cic.web.app

_{(expires Sun, 26 Jun 2022 12:45:22 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

[github-actions]

Size Comparison

Details

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
boids	172.502	172.502	0	0.000%
contexts	109.604	109.604	0	0.000%
counter	86.551	86.551	0	0.000%
counter_functional	87.200	87.200	0	0.000%
dyn_create_destroy_apps	89.691	89.691	0	0.000%
file_upload	102.626	102.626	0	0.000%
function_memory_game	166.910	166.910	0	0.000%
function_router	349.777	349.777	0	0.000%
function_todomvc	161.558	161.558	0	0.000%
futures	226.277	226.277	0	0.000%
game_of_life	107.188	107.188	0	0.000%
inner_html	83.618	83.618	0	0.000%
js_callback	112.829	112.829	0	0.000%
keyed_list	195.088	195.088	0	0.000%
mount_point	86.181	86.181	0	0.000%
nested_list	115.513	115.513	0	0.000%
node_refs	93.596	93.596	0	0.000%
password_strength	1538.306	1538.306	0	0.000%
portals	97.206	97.206	0	0.000%
router	318.712	318.712	0	0.000%
simple_ssr	154.478	154.478	0	0.000%
ssr_router	395.650	395.650	0	0.000%
suspense	110.519	110.519	0	0.000%
timer	89.287	89.287	0	0.000%
todomvc	142.614	142.614	0	0.000%
two_apps	87.159	87.159	0	0.000%
web_worker_fib	153.407	153.407	0	0.000%
webgl	87.438	87.438	0	0.000%

✅ None of the examples has changed their size significantly.

[WorldSEnder]

For anybody wondering: 1.56.1 is the latest 1.56 patch version.