[gha] update ubuntu build base to 20.04

Signed-off-by: R4SAS <r4sas@i2pmail.org>

.github/workflows/build.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   build-make:
     name: Make with USE_UPNP=${{ matrix.with_upnp }}
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: true
       matrix:
@@ -21,7 +21,7 @@ jobs:
       run: make USE_UPNP=${{ matrix.with_upnp }} -j3
   build-cmake:
     name: CMake with -DWITH_UPNP=${{ matrix.with_upnp }}
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: true
       matrix:
@@ -40,14 +40,13 @@ jobs:
         make -j3
   build-static:
     name: Static build with UPnP
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v2
     - name: install packages
       run: |
-        sudo add-apt-repository ppa:mhier/libboost-latest
         sudo apt-get update
-        sudo apt-get install build-essential libboost1.74-dev libminiupnpc-dev libssl-dev zlib1g-dev
+        sudo apt-get install build-essential libboost-all-dev libminiupnpc-dev libssl-dev zlib1g-dev
     - name: build application
       run: make DEBUG=no USE_STATIC=yes USE_UPNP=yes -j`nproc`
     - name: Upload artifacts