Bump mkdocs-material version for security (#186)

* Require mkdocs-material version >=9.5.5 for avoiding security
vulnerability 64496.
* Bump python version from 3.7 to 3.9 for
"pylint & safety" and "build docs" tests.

.github/workflows/ci_tests.yml

@@ -21,7 +21,7 @@ jobs:
       skip_pre-commit_hooks: pylint,pylint-tests
 
       # pylint & safety
-      python_version_pylint_safety: "3.7"
+      python_version_pylint_safety: "3.9"
       run_pylint: true
       pylint_runs: |
         --rcfile=pyproject.toml tripper
@@ -46,7 +46,7 @@ jobs:
 
       # Build documentation
       run_build_docs: true
-      python_version_docs: "3.7"
+      python_version_docs: "3.9"
       update_python_api_ref: true
       update_docs_landing_page: true
       package_dirs: tripper

pyproject.toml

@@ -37,7 +37,7 @@ docs = [
     "mike ~=2.0",
     "mkdocs ~=1.5",
     "mkdocs-awesome-pages-plugin ~=2.9",
-    "mkdocs-material ~=9.2",
+    "mkdocs-material >=9.5.5",
     "mkdocstrings[python-legacy] ~=0.22.0",
     "EMMOntoPy ~=0.7",
     "rdflib ~=6.3",
@@ -66,7 +66,7 @@ dev = [
     "mike ~=2.0",
     "mkdocs ~=1.5",
     "mkdocs-awesome-pages-plugin ~=2.9",
-    "mkdocs-material ~=9.2",
+    "mkdocs-material >=9.5.5",
     "mkdocstrings[python-legacy] ~=0.22.0",
     "pre-commit ~=2.21",
     "pylint ~=2.13",