chore: bump Go version to 1.26 in Dockerfile and CI workflows

Required for crypto/hpke stdlib package used by HPKE encryption.

Author: corylanou

.github/workflows/release.yml

@@ -33,7 +33,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.26'
 
       - id: release
         uses: bruceadams/get-release@v1.3.2

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
 
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.24'
+          go-version: '1.26'
 
       - name: Run unit tests
         run: go test -v ./...

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.24 AS builder
+FROM golang:1.26 AS builder
 
 WORKDIR /src/ltx
 COPY . .