Upgrade go-getter to v1.5.0

[alisdair]

Upstream changelog:

v1.5.0

• Add support for aws_profile query paramter 261
• Bump dependency for CVE-2020-16845 278

v1.4.2

• Expose a Umask option to mask file permissions when storing local files or decompressing an archive. Helpful for clearing setuid or other sensitive bits.
• feat(detector): provide a detector for repositories hosted on GitLab.com
• Use default AWS credential chain under normal circumstances

---

Also run go mod tidy.

Fixes #20439 (via the AWS credential chain change in 1.4.2)

[codecov]

Codecov Report

Merging #26762 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

Impacted Files	Coverage Δ
internal/providercache/package_install.go	22.93% <100.00%> (ø)
terraform/evaluate.go	53.11% <0.00%> (+0.41%)	⬆️
backend/remote/backend_common.go	52.32% <0.00%> (+0.71%)	⬆️
terraform/node_resource_apply_instance.go	75.78% <0.00%> (+0.78%)	⬆️
terraform/eval_diff.go	67.43% <0.00%> (+0.91%)	⬆️
dag/marshal.go	54.79% <0.00%> (+1.36%)	⬆️

[ghost]

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