fix: missing tex-gyre dependency

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

Author: skjnldsv

.github/workflows/sphinxbuild.yml

@@ -81,6 +81,7 @@ jobs:
           --no-install-recommends \
           python3-pil \
           python3-pip \
+          tex-gyre \
           texlive-fonts-recommended \
           latexmk \
           texlive-latex-extra \