Update dependencies

[pdecat]

This PR updates all dependencies, most notably terraform SDK which reveals an error in recently added changes.

make testacc TEST=./pagerduty/ TESTARGS='-run=TestAccPagerDutyService_AlertContentGrouping'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./pagerduty/ -v -run=TestAccPagerDutyService_AlertContentGrouping -timeout 120m
=== RUN   TestAccPagerDutyService_AlertContentGrouping
    resource_pagerduty_service_test.go:206: Step 2/2 error: Check failed: Check 8/12 error: pagerduty_service.foo: list or set attribute 'alert_grouping_parameters.0.config' must be checked by element count key (alert_grouping_parameters.0.config.#) or element value keys (e.g. alert_grouping_parameters.0.config.0). Set element value checks should use TestCheckTypeSet functions instead.
--- FAIL: TestAccPagerDutyService_AlertContentGrouping (14.37s)
FAIL
FAIL    github.com/terraform-providers/terraform-provider-pagerduty/pagerduty   14.381s
FAIL
make: *** [GNUmakefile:17: testacc] Error 1

Note: this PR is just the result from running go get -u ./... && go mod tidy && go mod vendor

[pdecat]

The new terraform SDK check comes from hashicorp/terraform-plugin-sdk#920 which was released in https://github.com/hashicorp/terraform-plugin-sdk/blob/v2.13.0/CHANGELOG.md#2130-march-31-2022

[pdecat]

As I suggested in #525 (comment),
maybe vendored dependencies should be dropped altogether to only rely on golang modules with go.sum, and avoid having so many files impacted on dependencies updates.

[pdecat]

Switching to go 1.18 is required by newer hcl v2 version:

Without this:

make testacc TEST=./pagerduty/ TESTARGS='-run=TestAccPagerDutyService_AlertContentGrouping'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./pagerduty/ -v -run=TestAccPagerDutyService_AlertContentGrouping -timeout 120m
# github.com/hashicorp/hcl/v2
vendor/github.com/hashicorp/hcl/v2/diagnostic_typeparams.go:22:22: type parameter requires go1.18 or later (-lang was set to go1.16; check go.mod)
vendor/github.com/hashicorp/hcl/v2/diagnostic_typeparams.go:22:24: undeclared name: any (requires version go1.18 or later)
FAIL    github.com/terraform-providers/terraform-provider-pagerduty/pagerduty [build failed]
FAIL
make: *** [GNUmakefile:17: testacc] Error 2

See hashicorp/hcl@c3b6715#diff-33ef32bf6c23acb95f5902d7097b7a1d5128ca061167ec0716715b0b9eeaa5f6R3
and hashicorp/hcl@88ecd13#diff-33ef32bf6c23acb95f5902d7097b7a1d5128ca061167ec0716715b0b9eeaa5f6R3

[NargiT]

I would like to see this PR finished and merged. Such an important piece of the infrastructure cannot be left with old dependencies. (rf: #732)