chore(deps): update actions/checkout action to v6

[terraform-ibm-modules-ops]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

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Configuration

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This PR has been generated by Renovate Bot.

[terraform-ibm-modules-ops]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: undefined

Command failed: git submodule update --remote --merge && export CUSTOM_DIRECTORY=/tmp && export PIPX_GLOBAL_HOME=/tmp && export PATH=$PATH:/tmp && make dependency-install-darwin-linux && cp /opt/containerbase/tools/golang/*/bin/gofmt /tmp

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
make: *** [Makefile:61: dependency-install-darwin-linux] Error 100