fix(deps): update module golang.org/x/mod to v0.21.0

[stackit-pipeline]

This PR contains the following updates:

Package	Type	Update	Change
golang.org/x/mod	require	minor	v0.20.0 -> v0.21.0

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This PR has been generated by Renovate Bot.

[stackit-pipeline]

ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• The go directive was updated for compatibility reasons

Details:

Package	Change
go	1.22 -> 1.23.3

[vicentepinto98]

Let's put this on hold, as it may require further changes to upgrade to go 1.23