remove python 3.7 which is eol

.github/workflows/amd64_linux_bazel.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.8', '3.9', '3.10', '3.11']
       fail-fast: false
     env:
       CC:  gcc-12

.github/workflows/amd64_macos_bazel.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.8', '3.9', '3.10', '3.11']
       fail-fast: false
     steps:
       - name: Check out repository code

.github/workflows/amd64_windows_bazel.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         runner: [windows-2022, windows-2019]
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.8', '3.9', '3.10', '3.11']
       fail-fast: false # Don't cancel all jobs if one fails.
     runs-on: ${{ matrix.runner }}
     #runs-on: windows-latest