Bump golang from 1.21.2 to 1.21.3

[dependabot[bot]]

Bumps golang from 1.21.2 to 1.21.3.

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Release note:

Bumps golang from 1.21.2 to 1.21.3.

[gardener-robot-ci-2]

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[MartinWeindel]

/ok-to-test