drop Python 3.7 from default bundled lockfiles (#21389)

As a consequence, most tests no longer work with 3.7 since -- for example -- the lockfile with pytest does not support 3.7. This downgrades 3.7 to "probably works but not well tested", which is the same state as 3.6. Since 3.7 has been EoL for over a year I think this is reasonable. This opens up the way for Python 3.13 support in lockfiles among other benefits. As another consequence, lockfiles are regenerated which means we have some new versions coming along for the ride. The pretty lockfile diff does not seem to work with the generation script though --> #21388 Uses of Pants can still use 3.7 by generating their own lockfiles. Deprecation plan announced at https://www.pantsbuild.org/blog/2024/08/24/venerable-pythons Based off work started in #21314 ref #21184, #21103, #20852
pantsbuild · Sep 12, 2024 · a7e6d4f · a7e6d4f
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diff --git a/build-support/bin/generate_builtin_lockfiles.py b/build-support/bin/generate_builtin_lockfiles.py
@@ -65,7 +65,7 @@
 logger = logging.getLogger(__name__)
 
 
-default_python_interpreter_constraints = "CPython>=3.7,<4"
+default_python_interpreter_constraints = "CPython>=3.8,<4"
 
 
 ToolBaseT = TypeVar("ToolBaseT")

diff --git a/docs/notes/2.24.x.md b/docs/notes/2.24.x.md
@@ -24,6 +24,13 @@ We offer [formal sponsorship tiers for companies](https://www.pantsbuild.org/spo
 
 ### Backends
 
+#### Python
+
+The default lockfiles bundled with Pants for various tools (ex: to run `black`) no longer support Python 3.7.  The minimum Python version is now 3.8.  Pants still supports running Python 3.7 (and earlier!) user code, but you will need to [generate your own lockfiles](https://www.pantsbuild.org/stable/docs/python/overview/lockfiles#lockfiles-for-tools).  See the announcement at <https://www.pantsbuild.org/blog/2024/08/24/venerable-pythons> for further context.
+
+As a consequence of the lockfile generation, newer versions of many tools are now included in the default lockfiles.
+
+
 
 
 ### Plugin API changes

diff --git a/src/python/pants/backend/cc/lint/clangformat/clangformat.lock b/src/python/pants/backend/cc/lint/clangformat/clangformat.lock
@@ -6,7 +6,7 @@
 // {
 //   "version": 3,
 //   "valid_for_interpreter_constraints": [
-//     "CPython<4,>=3.7"
+//     "CPython<4,>=3.8"
 //   ],
 //   "generated_with_requirements": [
 //     "clang-format<16,>=14.0.3"
@@ -24,6 +24,7 @@
   "allow_wheels": true,
   "build_isolation": true,
   "constraints": [],
+  "excluded": [],
   "locked_resolves": [
     {
       "locked_requirements": [
@@ -71,15 +72,16 @@
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   ],
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   "style": "universal",

diff --git a/src/python/pants/backend/codegen/protobuf/python/grpclib.lock b/src/python/pants/backend/codegen/protobuf/python/grpclib.lock
@@ -6,7 +6,7 @@
 // {
 //   "version": 3,
 //   "valid_for_interpreter_constraints": [
-//     "CPython<4,>=3.7"
+//     "CPython<4,>=3.8"
 //   ],
 //   "generated_with_requirements": [
 //     "grpclib[protobuf]<1,>=0.4"
@@ -24,6 +24,7 @@
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