fix(deps): bump dependency go from 1.25.5 to 1.25.6 (#38)

| datasource     | package | from   | to     |
| -------------- | ------- | ------ | ------ |
| golang-version | go      | 1.25.5 | 1.25.6 |

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v6
       with:
-        go-version: 1.25.5
+        go-version: 1.25.6
     - name: Checkout
       uses: actions/checkout@v6
     - name: install dep

go.mod

@@ -2,4 +2,4 @@ module github.com/mathieu-keller/epub-parser/v2
 
 go 1.23
 
-toolchain go1.25.5
+toolchain go1.25.6