Bump github checkout action version

"The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2."

.github/workflows/freebsd.yml

@@ -11,7 +11,7 @@ jobs:
  runs-on: macos-12
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v4
  - name: make
  uses: vmactions/freebsd-vm@v0
  with:

.github/workflows/macos.yml

@@ -12,7 +12,7 @@ jobs:
  runs-on: macos-latest
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v4
  - name: make
  run: make
  - name: install check

.github/workflows/openbsd.yml

@@ -11,7 +11,7 @@ jobs:
  runs-on: macos-12
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v4
  - name: make
  uses: vmactions/openbsd-vm@v0
  with:

.github/workflows/ubuntu.yml

@@ -12,7 +12,7 @@ jobs:
  runs-on: ubuntu-latest
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v4
  - name: make
  run: make
  - name: install check
@@ -25,7 +25,7 @@ jobs:
  runs-on: ubuntu-latest
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v4
  - uses: nttld/setup-ndk@v1
  with:
  ndk-version: r21e

.github/workflows/windows.yml

@@ -15,7 +15,7 @@ jobs:
  shell: msys2 {0}
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v4
  - uses: msys2/setup-msys2@v2
  with:
  msystem: MINGW64