Dockerfile : Add urllib3 1.26.18

We need to specify a 1.26.x version of urllib3 when installing sphinx, otherwise urllib3 2.x is installed which isn't compatible with the CentOS 7 system OpenSSL version of 1.0.2. This then leads to issues using the `github` module on CI.
GafferHQ · Jan 16, 2024 · 3bbd6e0 · 3bbd6e0
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diff --git a/Changes.md b/Changes.md
@@ -1,3 +1,9 @@
+2.x.x
+=====
+
+- Dockerfile :
+  - Fixed issues with `github` module on CI by installing `urllib3` 1.26.18.
+
 2.1.0
 =====
 

diff --git a/Dockerfile b/Dockerfile
@@ -119,6 +119,7 @@ RUN yum install -y yum-versionlock && \
 # Note: When updating these, also update the MacOS setup in .github/workflows/main.yaml
 # (in GafferHQ/gaffer).
 	pip install \
+		urllib3==1.26.18 \
 		sphinx==4.3.1 \
 		sphinx_rtd_theme==1.0.0 \
 		myst-parser==0.15.2 \