chore(deps): update actions/setup-go action to v6 (#694)

* chore(deps): update actions/setup-go action to v6

* fix: remove GO_VERSION environment variable and use go.mod for Go version in CI workflows

---------

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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -19,9 +19,6 @@ permissions:
   packages: write
   id-token: write # Required for Codecov
 
-env:
-  GO_VERSION: 1.23
-
 jobs:
   unit-tests:
     name: Unit Tests
@@ -35,9 +32,9 @@ jobs:
           path: ./bin/
           key: binaries
       - name: Setup Golang
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
-          go-version: "${{ env.GO_VERSION }}"
+          go-version-file: "go.mod"
       - name: Install envtest
         run: make envtest
       - name: Setup envtest
@@ -58,9 +55,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
       - name: Setup Golang
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
-          go-version: "${{ env.GO_VERSION }}"
+          go-version-file: "go.mod"
       - name: Generate manifests
         run: make manifests
       - name: Check nothing has changed
@@ -72,9 +69,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
-          go-version: "${{ env.GO_VERSION }}"
+          go-version-file: "go.mod"
           cache: false
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6

.github/workflows/release.yaml

@@ -5,9 +5,6 @@ on:
     tags:
       - "v*"
 
-env:
-  GO_VERSION: 1.23
-
 permissions:
   contents: write
   packages: write
@@ -27,9 +24,9 @@ jobs:
         run: git fetch --force --tags
 
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
-          go-version: "${{ env.GO_VERSION }}"
+          go-version-file: "go.mod"
 
       - name: Get ldflags env values
         run: |