Update go module directive to v1.26.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	golang	minor	1.23.0 → 1.26.3

---

Release Notes

golang/go (go)

v1.26.3

v1.26.2

v1.26.1

v1.26.0

v1.25.10

v1.25.9

v1.25.8

v1.25.7

v1.25.6

v1.25.5

v1.25.4

v1.25.3

v1.25.2

v1.25.1

v1.25.0

v1.24.13

v1.24.12

v1.24.11

v1.24.10

v1.24.9

v1.24.8

v1.24.7

v1.24.6

v1.24.5

v1.24.4

v1.24.3

v1.24.2

v1.24.1

v1.24.0

v1.23.12

v1.23.11

v1.23.10

v1.23.9

v1.23.8

v1.23.7

v1.23.6

v1.23.5

v1.23.4

v1.23.3

v1.23.2

v1.23.1

---

Configuration

📅 Schedule: (in timezone US/Eastern)

• Branch creation
  • "every weekend"
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: sdk/runtime/go.sum

Command failed: go get -t ./...
go: downloading github.com/distribution/reference v0.6.0
go: downloading github.com/iancoleman/strcase v0.3.0
go: downloading github.com/pelletier/go-toml/v2 v2.1.1
go: downloading golang.org/x/sync v0.15.0
go: downloading github.com/stretchr/testify v1.10.0
go: downloading github.com/opencontainers/go-digest v1.0.0
go: downloading github.com/davecgh/go-spew v1.1.1
go: downloading github.com/pmezard/go-difflib v1.0.0
go: downloading gopkg.in/yaml.v3 v3.0.1
go: python-sdk imports
	python-sdk/internal/dagger: package python-sdk/internal/dagger is not in std (/runner/cache/others/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.26.3.linux-amd64/src/python-sdk/internal/dagger)