Update Python to v3.12.6

CUDA_VERSION_MATRIX.md

 # CUDA Version Matrix
 
-Image tags = Julia versions
+Image tags = R versions
 
 Topmost entry = Tag `latest`
 
 | R     | Python  | SAGA[^1] | CUDA   | cuBLAS    | cuDNN     | NCCL   | TensorRT  | Linux distro |
 |:------|:--------|:---------|:-------|:----------|:----------|:-------|:----------|:-------------|
-| 4.4.1 | 3.12.5  | 7.3.0    | 12.6.1 | 12.6.1.4  | 8.9.7.29  | 2.22.3 | 10.3.0.26 | Ubuntu 22.04 |
+| 4.4.1 | 3.12.6  | 7.3.0    | 12.6.1 | 12.6.1.4  | 8.9.7.29  | 2.22.3 | 10.3.0.26 | Ubuntu 22.04 |
 | 4.4.0 | 3.12.4  | 7.3.0    | 12.5.0 | 12.5.2.13 | 8.9.7.29  | 2.21.5 | 10.0.1.6  | Ubuntu 22.04 |
 | 4.3.3 | 3.11.9  | 7.3.0    | 11.8.0 | 11.11.3.6 | 8.9.6.50  | 2.15.5 | 8.5.3[^2] | Ubuntu 22.04 |
 | 4.3.2 | 3.11.8  | 7.3.0    | 11.8.0 | 11.11.3.6 | 8.9.6.50  | 2.15.5 | 8.5.3[^2] | Ubuntu 22.04 |

VERSION_MATRIX.md

 # Version Matrix
 
-Image tags = Julia versions
+Image tags = R versions
 
 Topmost entry = Tag `latest`
 
@@ -8,7 +8,7 @@ Topmost entry = Tag `latest`
 
 | R     | Python  | Jupyter Hub | Jupyter Lab | code‑server (Code) | RStudio       | Neovim | Git    | Git LFS | Pandoc | CRAN date  | Linux distro |
 |:------|:--------|:------------|:------------|:-------------------|:--------------|:-------|:-------|:--------|:-------|:-----------|:-------------|
-| 4.4.1 | 3.12.5  | 5.1.0       | 4.2.5       | 4.92.2 (1.92.2)    | 2024.04.2+764 | 0.10.1 | 2.46.0 | 3.5.1   | 3.2    |            | Debian 12    |
+| 4.4.1 | 3.12.6  | 5.1.0       | 4.2.5       | 4.92.2 (1.92.2)    | 2024.04.2+764 | 0.10.1 | 2.46.0 | 3.5.1   | 3.2    |            | Debian 12    |
 | 4.4.0 | 3.12.4  | 5.0.0       | 4.2.2       | 4.90.0 (1.90.0)    | 2024.04.2+764 | n/a    | 2.45.2 | 3.5.1   | 3.1.11 | 2024‑06‑14 | Debian 12    |
 | 4.3.3 | 3.11.9  | 4.1.5       | 4.1.6       | 4.23.0 (1.88.0)    | n/a           | n/a    | 2.44.0 | 3.5.1   | 3.1.11 | 2024‑04‑24 | Debian 12    |
 | 4.3.2 | 3.11.8  | 4.0.2       | 4.1.2       | 4.21.2 (1.86.2)    | n/a           | n/a    | 2.44.0 | 3.4.1   | 3.1.11 | 2024‑02‑29 | Debian 12    |

base/latest.Dockerfile

@@ -202,12 +202,10 @@ RUN dpkgArch="$(dpkg --print-architecture)" \
     done; \
   else \
     ## Force update pip, setuptools and wheel
-    curl -sLO https://bootstrap.pypa.io/get-pip.py; \
-    python get-pip.py \
+    pip install --upgrade --force-reinstall \
       pip \
       setuptools \
       wheel; \
-    rm get-pip.py; \
   fi \
   ## Install font MesloLGS NF
   && mkdir -p /usr/share/fonts/truetype/meslo \