deps: bump Go to 1.26.4 across go.mod, Dockerfiles, GH Actions

Workspace-wide sync. luxfi/node already shipped on 1.26.4 in v1.30.6
(commit 121aca1fa9); this is the cross-repo catch-up.

.github/workflows/build-test.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.26.3'
+          go-version: '1.26.4'
           check-latest: true
       - name: Run static analysis tests
         shell: bash
@@ -32,7 +32,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.26.3'
+          go-version: '1.26.4'
       - run: go test -v -timeout 10m ./...
         env:
           CGO_ENABLED: "0"
@@ -53,7 +53,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.26.3'
+          go-version: '1.26.4'
       - name: Run e2e tests
         shell: bash
         run: scripts/tests.e2e.sh

.github/workflows/chaos-test.yml

@@ -55,7 +55,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.26.3'
+          go-version: '1.26.4'
           check-latest: true
 
       - name: Cache Go modules

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.26.3'
+          go-version: '1.26.4'
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v6
         with: