Update mongodb_exporter from 0.40.0 to 0.42.0

[prometheus-rpm-bot]

https://github.com/percona/mongodb_exporter/releases/tag/v0.42.0
Release notes:

## Docker images
To automatically pull the appropriate Docker image for your platform, use

docker pull percona/mongodb_exporter:0.42.0
You can also specify a specific architecture image

docker pull percona/mongodb_exporter:0.42.0-amd64
docker pull percona/mongodb_exporter:0.42.0-arm64v8

## What's Changed
* Remove system colections from collstats by @rolatsch in https://github.com/percona/mongodb_exporter/pull/917
* Bump go.mongodb.org/mongo-driver from 1.16.1 to 1.17.0 by @dependabot in https://github.com/percona/mongodb_exporter/pull/915
* PMM-7 update changelog and reference by @BupycHuk in https://github.com/percona/mongodb_exporter/pull/920
* Bump github.com/alecthomas/kong from 0.9.0 to 1.2.1 by @dependabot in https://github.com/percona/mongodb_exporter/pull/909
* Serving SRV targets and getting all nodes in single request by @adnull in https://github.com/percona/mongodb_exporter/pull/835
* Bump go.mongodb.org/mongo-driver from 1.17.0 to 1.17.1 by @dependabot in https://github.com/percona/mongodb_exporter/pull/926
* PMM-13426: Fix PBM collector memory leak by @idoqo in https://github.com/percona/mongodb_exporter/pull/928
* Release 0.41.2 by @BupycHuk in https://github.com/percona/mongodb_exporter/pull/929
* PMM-7 update goreleaser version and config by @BupycHuk in https://github.com/percona/mongodb_exporter/pull/931
* Bump github.com/prometheus/client_golang from 1.19.1 to 1.20.4 by @dependabot in https://github.com/percona/mongodb_exporter/pull/914
* PMM-13207 update go version by @idoqo in https://github.com/percona/mongodb_exporter/pull/934
* Bump github.com/golangci/golangci-lint from 1.59.1 to 1.61.0 in /tools by @dependabot in https://github.com/percona/mongodb_exporter/pull/911
* Bump github.com/prometheus/exporter-toolkit from 0.11.0 to 0.13.0 by @dependabot in https://github.com/percona/mongodb_exporter/pull/908
* Bump github.com/prometheus/client_golang from 1.20.4 to 1.20.5 by @dependabot in https://github.com/percona/mongodb_exporter/pull/937
* PMM-13426: update PBM sdk by @idoqo in https://github.com/percona/mongodb_exporter/pull/939

## New Contributors
* @rolatsch made their first contribution in https://github.com/percona/mongodb_exporter/pull/917

**Full Changelog**: https://github.com/percona/mongodb_exporter/compare/v0.41.2...v0.42.0