Increase golangci-lint timeout

[kishen-v]

What this PR does / why we need it:

• Increase the timeout from 10m to 20m to avoid timeout-related failures in CI.

level=info msg="[runner] processing took 66.485939ms with stages: nolint_filter: 47.218942ms, exclusion_rules: 15.347569ms, generated_file_filter: 2.40804ms, path_relativity: 655.959µs, skip_dirs: 275.524µs, path_absoluter: 252.833µs, skip_files: 129.031µs, identifier_marker: 71.03µs, invalid_issue: 58.02µs, cgo: 39.28µs, filename_unadjuster: 22.781µs, max_same_issues: 1.58µs, fixer: 1.2µs, exclusion_paths: 810ns, diff: 590ns, sort_results: 570ns, path_shortener: 530ns, uniq_by_line: 490ns, max_from_linter: 320ns, source_code: 310ns, path_prettifier: 190ns, max_per_file_from_linter: 180ns, severity-rules: 160ns"
level=info msg="[runner] linters took 4m37.98877605s with stages: goanalysis_metalinter: 4m37.922129007s"
level=info msg="File cache stats: 3 entries of total size 17.9KiB"
level=error msg="Timeout exceeded: try increasing it by passing --timeout option"
make: *** [Makefile:501: lint] Error 4

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Increase golangci-lint timeout to avoid jobs being timed-out on CI.

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[kishen-v]

/cc @Prajyot-Parab

[Prajyot-Parab]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishen-v, Prajyot-Parab

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