tools: pin markdown lint tool versions
Updated versions of markdownlint are requiring newer versions of node. Pin
everything to compatible older versions that do not add rules we would
ignore.
#!/bin/bash -xe
-dnf -y module enable nodejs:12
+dnf -y module enable nodejs:14
dnf -y install nodejs
-npm install -g markdownlint markdownlint-cli2
+npm install -g markdownlint@v0.25.1 markdownlint-cli2@v0.4.0
