Modernize github actions

Author: joto

.github/workflows/java.yml

@@ -6,7 +6,7 @@ jobs:
   maven-ubuntu20:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: sudo apt-get install protobuf-compiler
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
@@ -18,7 +18,7 @@ jobs:
   maven-ubuntu22:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: sudo apt-get install protobuf-compiler
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
@@ -30,7 +30,7 @@ jobs:
   ant-ubuntu20:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: sudo apt-get install protobuf-compiler libprotobuf-java
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
@@ -42,7 +42,7 @@ jobs:
   ant-ubuntu22:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: sudo apt-get install protobuf-compiler libprotobuf-java
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1

README.md

@@ -13,8 +13,8 @@ Note that this is a low-level library that does only part of the
 encoding/decoding needed for actually writing/reading an OSM PBF file. For
 something more complete see [libosmium](https://osmcode.org/libosmium/).
 
-[![Github Actions C Build Status](https://github.com/openstreetmap/OSM-binary/workflows/C%20CI/badge.svg?branch=master)](https://github.com/openstreetmap/OSM-binary/actions)
-[![Github Actions Java Build Status](https://github.com/openstreetmap/OSM-binary/workflows/Java%20CI/badge.svg?branch=master)](https://github.com/openstreetmap/OSM-binary/actions)
+[![Github Actions C++ CI](https://github.com/openstreetmap/OSM-binary/actions/workflows/c.yml/badge.svg)](https://github.com/openstreetmap/OSM-binary/actions/workflows/c.yml)
+[![Github Actions Java CI](https://github.com/openstreetmap/OSM-binary/actions/workflows/java.yml/badge.svg)](https://github.com/openstreetmap/OSM-binary/actions/workflows/java.yml)
 [![Packaging status](https://repology.org/badge/tiny-repos/libosmpbf.svg)](https://repology.org/project/libosmpbf/versions)
 
 ## Java Version