fix: bump hashicorp/vault-action from 2 to 4

Bumps [hashicorp/vault-action](https://github.com/hashicorp/vault-action) from 2 to 4.
- [Release notes](https://github.com/hashicorp/vault-action/releases)
- [Changelog](https://github.com/hashicorp/vault-action/blob/main/CHANGELOG.md)
- [Commits](hashicorp/vault-action@v2...v4)

---
updated-dependencies:
- dependency-name: hashicorp/vault-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/agent-issue.yml

@@ -8,7 +8,7 @@ jobs:
     - ubuntu-latest
     steps:
     - id: agent_secrets
-      uses: hashicorp/vault-action@v2
+      uses: hashicorp/vault-action@v4
       with:
         method: userpass
         password: ${{ secrets.VAULT_PASSWORD }}

.github/workflows/agent-markdown.yml

@@ -4,7 +4,7 @@ jobs:
     - ubuntu-latest
     steps:
     - id: agent_secrets
-      uses: hashicorp/vault-action@v2
+      uses: hashicorp/vault-action@v4
       with:
         method: userpass
         password: ${{ secrets.VAULT_PASSWORD }}

.github/workflows/changelog.yml

@@ -5,7 +5,7 @@ jobs:
     - ubuntu-latest
     steps:
     - id: gitea_secrets
-      uses: hashicorp/vault-action@v2
+      uses: hashicorp/vault-action@v4
       with:
         method: userpass
         password: ${{ secrets.VAULT_PASSWORD }}

.github/workflows/issue-agent.yml

@@ -8,15 +8,15 @@ jobs:
     - ubuntu-latest
     steps:
     - id: agent_secrets
-      uses: hashicorp/vault-action@v2
+      uses: hashicorp/vault-action@v4
       with:
         method: userpass
         password: ${{ secrets.VAULT_PASSWORD }}
         secrets: servc/data/iac/servc agent-auth-token | AGENT_TOKEN ;
         url: ${{ secrets.VAULT_ADDR }}
         username: ${{ secrets.VAULT_USERNAME }}
     - id: gitea_secrets
-      uses: hashicorp/vault-action@v2
+      uses: hashicorp/vault-action@v4
       with:
         method: userpass
         password: ${{ secrets.VAULT_PASSWORD }}