build: upgrade CI Go version to 1.25 and Elasticsearch to 8.x

- Bump go-version from 1.20 to 1.25 across all workflows
  (lint, test, main, release) to match go.mod requirement
- Upgrade test Elasticsearch service image from 7.17.9 to 8.17.1

Author: ravisuhag

.github/workflows/lint.yml

@@ -11,7 +11,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-go@v6
         with:
-          go-version: "1.20"
+          go-version: "1.25"
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.20"
+          go-version: "1.25"
       - name: Login to DockerHub
         uses: docker/login-action@v4
         with:

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.20"
+          go-version: "1.25"
       - name: Login to DockerHub
         uses: docker/login-action@v4
         with:

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     services:
       elasticsearch:
-        image: elasticsearch:7.17.9
+        image: elasticsearch:8.17.1
         ports:
           - 9200:9200
         env:
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
-          go-version: "1.20"
+          go-version: "1.25"
       - name: Install dependencies
         run: sudo apt-get install build-essential
       - name: Install packages