fix: address root causes of recurring CI failures on main

[MaxRink]

Summary

Fixes three root causes of recurring CI failures observed on the main branch:

1. Dependabot kubernetes group update failures — When dependabot recreates the kubernetes group PR (updating controller-runtime, cluster-api, etc.), CI fails because the updated dependencies require Go 1.25 but go.mod only declares go 1.24.7, causing golangci-lint to abort with: go language version (go1.24) used to build golangci-lint is lower than the targeted Go version (1.25.0)

2. TestPoolDeletionWithExistingIPAddresses test failure — controller-runtime's fake client (v0.21+) does not populate APIVersion on individual items returned by List. The APIVersion group filter in ListAddressesInUse and ListClaimsReferencingPool silently dropped all results, making ValidateDelete think no IPAddressClaim resources existed. This caused the webhook test to always fail after a controller-runtime upgrade. The index-based MatchingFields filter already guarantees only the correct resources are returned, so the loop was redundant and incorrect.

3. golangci-lint version mismatch — The PR workflow pinned golangci-lint to v2.2.1 which doesn't support Go 1.25. Updated to v2.11.4.

Root Cause

The core issue is that go.mod declared go 1.24.7 while the project effectively requires Go 1.25 (as reflected in CI workflow go-version: 1.25). This mismatch causes failures any time a dependency update is tested against Go 1.25.

Changes

• go.mod: go 1.24.7 → go 1.25
• internal/poolutil/pool.go: Remove redundant and incorrect APIVersion group filter in ListAddressesInUse and ListClaimsReferencingPool; rename loop variable addresses → claims in ListClaimsReferencingPool for clarity
• .github/workflows/pullrequests.yaml: Update golangci-lint to v2.11.4 (supports Go 1.25)
• .github/workflows/draft_release.yaml: Update go-version to ^1.25 to match go.mod

Verification

• go build ./... — ✅ passes
• go vet ./... — ✅ passes
• make test — ✅ all tests pass including TestPoolDeletionWithExistingIPAddresses
• golangci-lint run ./internal/poolutil/... — ✅ no lint issues

Relationship to Other PRs

• Supersedes the code fix from PR fix: restore CI compatibility after controller-runtime v0.22 upgrade (supersedes #135) #140 (which was based on a dependabot branch)
• Complements PR fix: add docker-licenses target to generate licenses at stable path for Docker build #143 (docker-licenses path fix, already merged into this analysis scope)
• Complements PR fix: strip go.mod comments from Makefile tool versions #144 (ENVTEST_VERSION sed pattern fix)

These are independent fixes targeting the same recurring CI failures on main.

[Copilot]

Pull request overview

Aligns repository tooling and utility logic with the project’s effective Go/tooling requirements and updated controller-runtime fake client behavior, eliminating recurring CI failures on main.

Changes:

• Bump go.mod Go version directive to 1.25 to match dependency requirements and CI configuration.
• Simplify poolutil list helpers by removing incorrect APIVersion-based filtering that breaks with newer controller-runtime fake client behavior.
• Update CI workflows to use a Go-1.25-compatible golangci-lint version and align draft release Go version with go.mod.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
internal/poolutil/pool.go	Removes redundant/incorrect APIVersion group filtering; returns indexed list results directly.
go.mod	Updates the Go version directive to 1.25.
.github/workflows/pullrequests.yaml	Updates golangci-lint version to one that supports Go 1.25.
.github/workflows/draft_release.yaml	Aligns release workflow Go version to ^1.25.

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[MaxRink]

Closing as redundant. After rebasing onto the current main, all substantive fixes from this PR are already present independently: go.mod is already at 1.26.5, the APIVersion group-filter in ListClaimsReferencingPool is already removed, and the golangci-lint / CI version bumps have already landed. The only remaining diff was a no-op variable rename (addresses -> claims) in internal/poolutil/pool.go, which isn't worth a standalone PR.