fix(pep440): renovate downgrades when rangeStrategy=bump (#15358)

lib/modules/versioning/pep440/index.spec.ts

@@ -168,6 +168,14 @@ describe('modules/versioning/pep440/index', () => {
     ${'==3.2.*,>=3.2.2'}    | ${'replace'}     | ${'3.2.2'}     | ${'4.1.1'}   | ${'==4.1.*'}
     ${'==3.2.*,>=3.2.2'}    | ${'replace'}     | ${'3.2.2'}     | ${'4.0.0'}   | ${'==4.0.*'}
     ${'>=1.0.0,<1.1.0'}     | ${'replace'}     | ${'1.0.0'}     | ${'1.2.0'}   | ${'>=1.2.0,<1.3.0'}
+    ${'<1.3.0'}             | ${'bump'}        | ${'1.3.0'}     | ${'0.9.2'}   | ${'<1.3.0'}
+    ${'<1.3.0'}             | ${'bump'}        | ${'0.9.0'}     | ${'0.9.2'}   | ${'<1.3.0'}
+    ${'<=1.3.0'}            | ${'bump'}        | ${'0.9.0'}     | ${'0.9.2'}   | ${'<=1.3.0'}
+    ${'<=1.3.0'}            | ${'bump'}        | ${'1.3.0'}     | ${'0.9.2'}   | ${'<=1.3.0'}
+    ${'<1.3.0'}             | ${'bump'}        | ${'1.3.0'}     | ${'1.6.0'}   | ${'<1.6.1'}
+    ${'<1.3.0'}             | ${'bump'}        | ${'0.9.0'}     | ${'1.6.0'}   | ${'<1.6.1'}
+    ${'<=1.3.0'}            | ${'bump'}        | ${'0.9.0'}     | ${'1.6.0'}   | ${'<=1.6.0'}
+    ${'<=1.3.0'}            | ${'bump'}        | ${'1.3.0'}     | ${'1.6.0'}   | ${'<=1.6.0'}
   `(
     'getNewValue("$currentValue", "$rangeStrategy", "$currentVersion", "$newVersion") === "$expected"',
     ({ currentValue, rangeStrategy, currentVersion, newVersion, expected }) => {

lib/modules/versioning/pep440/range.ts

@@ -316,6 +316,9 @@ function updateRangeValue(
     return range.operator + newVersion;
   }
   if (['==', '<='].includes(range.operator)) {
+    if (lte(newVersion, range.version)) {
+      return range.operator + range.version;
+    }
     return range.operator + newVersion;
   }