Update GitHub checkout action (#368)

Author: hpoettker

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
         run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
       - name: Install packages
         run: sudo apt install gcc-9 gcc-10 gcc-11 gcc-12
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Autoconf
         run: autoreconf -i -f
       - name: Configure
@@ -44,7 +44,7 @@ jobs:
     steps:
       - name: Install packages
         run: brew install automake libtool
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Autoconf
         run: autoreconf -i -f
       - name: Configure
@@ -83,7 +83,7 @@ jobs:
             base-devel
             gcc
             libiconv-devel
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Autoconf
         run: autoreconf -i -f
       - name: Configure

.github/workflows/codecov.yml

@@ -6,7 +6,7 @@ jobs:
     steps:
       - name: Install packages
         run: sudo apt install gettext
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Autoconf
         run: autoreconf -i -f
       - name: Configure

.gitignore

@@ -14,11 +14,13 @@ config.log
 config.status
 config.sub
 configure
+configure~
 depcomp
 install-sh
 libreadstat.la
 libtool
 ltmain.sh
+m4/
 Makefile
 Makefile.in
 missing
@@ -31,6 +33,7 @@ test_readstat
 *.log
 *.trs
 test_csv_to_dta*
+.vs/
 .vscode/
 *.swp
 dev/