fix(deps): update istio.io/istio digest to a26b3a1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
istio.io/istio	require	digest	d80ef7b -> a26b3a1

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

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[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: go.sum

Command failed: go get -d -t ./...
go: -d flag is deprecated. -d=true is a no-op
go: downloading github.com/corazawaf/coraza-coreruleset v0.0.0-20240226094324-415b1017abdc
go: downloading github.com/corazawaf/coraza/v3 v3.2.2
go: downloading github.com/dropmorepackets/haproxy-go v0.0.5
go: downloading github.com/jcchavezs/mergefs v0.1.0
go: downloading github.com/rs/zerolog v1.33.0
go: downloading istio.io/istio v0.0.0-20241129100331-a26b3a144519
go: downloading github.com/mccutchen/go-httpbin/v2 v2.15.0
go: downloading github.com/magefile/mage v1.15.1-0.20241124190125-32e01077f0aa
go: downloading gopkg.in/yaml.v3 v3.0.1
go: downloading github.com/mattn/go-colorable v0.1.13
go: downloading github.com/mattn/go-isatty v0.0.20
go: downloading github.com/valllabh/ocsf-schema-golang v1.0.3
go: downloading github.com/tidwall/gjson v1.18.0
go: downloading golang.org/x/sync v0.9.0
go: downloading github.com/corazawaf/libinjection-go v0.2.2
go: downloading github.com/petar-dambovaliev/aho-corasick v0.0.0-20240411101913-e07a1f0e8eb4
go: downloading rsc.io/binaryregexp v0.2.0
go: downloading golang.org/x/sys v0.27.0
go: downloading google.golang.org/protobuf v1.35.2
go: downloading github.com/tidwall/match v1.1.1
go: downloading github.com/tidwall/pretty v1.2.1
go: downloading golang.org/x/net v0.31.0
go: github.com/corazawaf/coraza-spoa/internal imports
	istio.io/istio/pkg/cache: cannot find module providing package istio.io/istio/pkg/cache

[renovate]

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