chore: upgrade all deps — Go 1.25, cert-manager v1.20, AliDNS SDK V1→V2, k8s v0.35

[Copilot]

The Alibaba Cloud Go SDK V1 (aliyun/alibaba-cloud-sdk-go) reached end-of-support March 2025 and was archived July 2025. This PR migrates to the official V2 SDK and brings all other dependencies current.

AliDNS SDK V1 → V2 (alidns-20150109/v5)

The V2 SDK uses a completely different client construction and pointer-based request/response API:

// Before (V1, archived)
client, _ := alidns.NewClientWithAccessKey(regionID, accessKeyID, accessKeySecret)
req := alidns.CreateAddDomainRecordRequest()
req.DomainName = domain
req.RR = rr
req.Type = typ
req.Value = val
client.AddDomainRecord(req)

// After (V2)
client, _ := alidns.NewClient(&openapi.Config{
    AccessKeyId:     tea.String(cfg.AccessKeyID),
    AccessKeySecret: tea.String(cfg.AccessKeySecret),
})
req := &alidns.AddDomainRecordRequest{}
req.SetDomainName(domain).SetRR(rr).SetType(typ).SetValue(val)
client.AddDomainRecord(req)

All response field accesses updated for pointer dereferencing via tea.StringValue(). Pagination loop updated to use resp.Body.DomainRecords.Record.

Removed broken import

github.com/cert-manager/cert-manager/pkg/issuer/acme/dns/util was removed in cert-manager v1.13+. Replaced with an inline unFqdn() helper.

Dependency versions

Dependency	Before	After
Go	1.20	1.25
cert-manager	v1.12.3	v1.20.0
aliyun/alibaba-cloud-sdk-go	v1.61.1473	removed
alibabacloud-go/alidns-20150109/v5	—	v5.3.1
k8s.io/client-go + apimachinery	v0.27.4	v0.35.2

Tooling

• Makefile: replaced obsolete kubebuilder v2.3.2 tarball download with setup-envtest (sigs.k8s.io/controller-runtime/tools/setup-envtest), matching the current cert-manager webhook-example pattern
• CI: updated all GitHub Actions to latest major versions (checkout@v4, setup-go@v5, buildx@v3, login-action@v3); Go version set to 1.25; removed now-redundant manual cache step
• Helm chart: appVersion → 1.20.0, chart version → 0.2.0
• .gitignore: added cert-manager-webhook-alidns and bin/ to prevent binary commits

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