CI: Ignore ResearchGate homepage in the links check (#3118)

Author: seisman

.github/workflows/check-links.yml

@@ -53,7 +53,7 @@ jobs:
           --exclude "^https://www.generic-mapping-tools.org/remote-datasets/%s$"
           --exclude "^https://hackmd.io/@pygmt"
           --exclude "^https://doi.org"
-          --exclude "^https://www.researchgate.net/project/"
+          --exclude "^https://www.researchgate.net/"
           --exclude "^https://test.pypi.org/simple/"
           --verbose
           "repository/**/*.rst"