Update dependency symfony/yaml to v5.4.21

This MR contains the following updates:

Package	Type	Update	Change
symfony/yaml (source)	require	patch	5.4.10 -> 5.4.21

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Release Notes

symfony/yaml

v5.4.21

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Changelog (https://github.com/symfony/yaml/compare/v5.4.20...v5.4.21)

• no significant changes

v5.4.19

Compare Source

Changelog (https://github.com/symfony/yaml/compare/v5.4.18...v5.4.19)

• no significant changes

v5.4.17

Compare Source

Changelog (https://github.com/symfony/yaml/compare/v5.4.16...v5.4.17)

• bug #​48331 fix dumping top-level tagged values (xabbuh)

v5.4.16

Compare Source

Changelog (https://github.com/symfony/yaml/compare/v5.4.15...v5.4.16)

• bug #​48333 parse unquoted digits in tag values as integers (xabbuh)

v5.4.14

Compare Source

Changelog (https://github.com/symfony/yaml/compare/v5.4.13...v5.4.14)

• no significant changes

v5.4.12

Compare Source

Changelog (https://github.com/symfony/yaml/compare/v5.4.11...v5.4.12)

• no significant changes

v5.4.11

Compare Source

Changelog (https://github.com/symfony/yaml/compare/v5.4.10...v5.4.11)

• no significant changes

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