Better b2 manual build (#431)

Author: lia-viam

.github/workflows/conan.yml

@@ -209,12 +209,7 @@ jobs:
           pip install conan
           conan profile detect
 
-          mkdir b2-tmp
-          echo '[requires]
-          b2/5.3.2
-          ' > b2-tmp/conanfile.txt
-          cat b2-tmp/conanfile.txt
-          conan install b2-tmp --build=b2/5.3.2 -s compiler.cppstd=14 -s:a compiler.cppstd=14
-          rm -r b2-tmp
+          conan install -r conancenter --update \
+          --tool-requires=b2/5.3.1 --build=b2/5.3.1 -s compiler.cppstd=14 -s:a compiler.cppstd=14
 
           conan create . --build=missing -s compiler.cppstd=14 -s:a compiler.cppstd=14