Fix all go version in the tests on 1.19

There is a regression error in go 1.22.
As the go.mod fixes the go version at 1.19, all github workflow now
use go 1.19.

.github/workflows/go_dvoting_test.yml

@@ -12,10 +12,10 @@ jobs:
     name: Scenario
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go ^1.17
-        uses: actions/setup-go@v2
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: ^1.17
+          go-version: '1.20'
 
       - name: Install crypto util from Dela
         run: |

.github/workflows/go_integration_tests.yml

@@ -11,10 +11,10 @@ jobs:
     name: Integration test
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go ^1.17
-        uses: actions/setup-go@v2
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: ^1.17
+          go-version: '1.20'
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
@@ -25,10 +25,10 @@ jobs:
     name: Test bad vote
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go ^1.17
-        uses: actions/setup-go@v2
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: ^1.17
+          go-version: '1.20'
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
@@ -39,10 +39,10 @@ jobs:
     name: Test crash
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go ^1.17
-        uses: actions/setup-go@v2
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: ^1.17
+          go-version: '1.20'
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
@@ -53,10 +53,10 @@ jobs:
     name: Test revote
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go ^1.17
-        uses: actions/setup-go@v2
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: ^1.17
+          go-version: '1.20'
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2

.github/workflows/go_scenario_test.yml

@@ -11,10 +11,10 @@ jobs:
     name: Tests
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go ^1.17
-        uses: actions/setup-go@v2
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: ^1.17
+          go-version: '1.20'
 
       - name: Install crypto util from Dela
         run: |

.github/workflows/go_test.yml

@@ -10,10 +10,10 @@ jobs:
     name: Tests
     runs-on: ubuntu-latest
     steps:
-      - name: Use Go >= 1.19
-        uses: actions/setup-go@v3
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: '>=1.19'
+          go-version: '1.20'
         id: go
 
       - name: Check out code into the Go module directory

.github/workflows/releases.yml

@@ -13,10 +13,10 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
 
-      - name: Use go
-        uses: actions/setup-go@v3
+      - name: Use Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: '>=1.18'
+          go-version: '1.20'
 
       - name: Install fpm
         run: |

go.mod

@@ -1,6 +1,6 @@
 module github.com/c4dt/d-voting
 
-go 1.19
+go 1.20
 
 require (
 	github.com/gorilla/mux v1.8.0