Use backslashes for Windows paths

.gitea/workflows/test.yaml

@@ -31,7 +31,7 @@ jobs:
       - name: Install Hashicorp Vault (on Windows)
         if: matrix.arch == 'windows-amd64'
         run: |
-          & "./scripts/vault-install.ps1"
+          & ".\scripts\vault-install.ps1"
         shell: pwsh
 
       - name: Start Vault in background (on Unix)
@@ -51,7 +51,7 @@ jobs:
           VAULT_ADDR: "https://127.0.0.1:8200"
           VAULT_SKIP_VERIFY: "true"
         run: |
-          & "./scripts/vault-start.ps1"
+          & ".\scripts\vault-start.ps1"
 
       - name: Setup Vault test data (on Unix)
         if: matrix.arch != 'windows-amd64'
@@ -72,7 +72,7 @@ jobs:
           VAULT_SKIP_VERIFY: "true"
         shell: pwsh
         run: |
-          & "./scripts/vault-setup.ps1"
+          & ".\scripts\vault-setup.ps1"
 
       - name: Vet
         run: go vet -v ./...