Fix error with assume-no-moving-gc

[Abuelodelanada]

Issue

This PR fixes canonical/cos-tool-snap#1

How to test it:

1. Build cos-tool: go build --ldflags '-extldflags "-static"'
2. Run it to check the error is gone:

$ ./cos-tool 

NAME:
   cos-tool - Validates Prometheus and Loki expressions, adds Juju Topology to label matchers

USAGE:
   cos-tool [global options] command [command options] [arguments...]

COMMANDS:
   transform, t                          
   validate-rules, v, lint, l, validate  
   validate-config                       
   help, h                               Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --format promql|logql, -f promql|logql  Inject expressions into promql|logql (default: "promql")
   --help, -h  

[simskij]

Seems like you updated all deps, not only the assume-no-gc one, so this will require some additional work to fix the unit tests before being ready to merge.

[Abuelodelanada]

Seems like you updated all deps, not only the assume-no-gc one, so this will require some additional work to fix the unit tests before being ready to merge.

I wanted to take the opportunity to update everything. The problem are not the tests. They fail with 1.18 in the CI, on localhost with 1.21 they pass.

Anyway, now only assume-no-gc is updated, we can update all deps in a next PR.