mod,x-pack/filebeat/input/cel: update mito to v1.23.2

[efd6]

Proposed commit message

mod,x-pack/filebeat/input/cel: update mito to v1.23.2

v1.23.2 of elastic/mito bumps the cel-go version to v0.28.0 and updates
the code required for correctly handling maps in that runtime version.

cel-go v0.28.0 fixes a bug in the runtime that caused error messages
to identify the wrong source location. Update the dependency and fix
the two test expectations that were tracking the incorrect locations.

This change is functionally equivalent to a back-port of c5890411.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

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