Rename nightly_6_1 params to nightly_next (#51)

Rename nightly_6_1 params to nightly_next; see
apple/swift-nio#3122

Author: rnro

.github/workflows/pull_request.yml

@@ -18,7 +18,7 @@ jobs:
       linux_5_9_arguments_override: "--explicit-target-dependency-import-check error"
       linux_5_10_arguments_override: "--explicit-target-dependency-import-check error"
       linux_6_0_arguments_override: "--explicit-target-dependency-import-check error"
-      linux_nightly_6_1_arguments_override: "--explicit-target-dependency-import-check error"
+      linux_nightly_next_arguments_override: "--explicit-target-dependency-import-check error"
       linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error"
 
   cxx-interop:

.github/workflows/unit_tests.yml

@@ -27,11 +27,11 @@ on:
         type: string
         description: "The arguments passed to swift test in the Linux 6.0 Swift version matrix job."
         default: ""
-      linux_nightly_6_1_enabled:
+      linux_nightly_next_enabled:
         type: boolean
         description: "Boolean to enable the Linux nightly 6.1 Swift version matrix job. Defaults to true."
         default: true
-      linux_nightly_6_1_arguments_override:
+      linux_nightly_next_arguments_override:
         type: string
         description: "The arguments passed to swift test in the Linux nightly 6.1 Swift version matrix job."
         default: ""
@@ -64,7 +64,7 @@ jobs:
             enabled: ${{ inputs.linux_6_0_enabled }}
           - image: "swiftlang/swift:nightly-6.1-jammy"
             swift_version: "nightly-6.1"
-            enabled: ${{ inputs.linux_nightly_6_1_enabled }}
+            enabled: ${{ inputs.linux_nightly_next_enabled }}
           - image: "swiftlang/swift:nightly-main-jammy"
             swift_version: "nightly-main"
             enabled: ${{ inputs.linux_nightly_main_enabled }}
@@ -87,7 +87,7 @@ jobs:
           COMMAND_OVERRIDE_5_9: "swift test ${{ inputs.linux_5_9_arguments_override }}"
           COMMAND_OVERRIDE_5_10: "swift test ${{ inputs.linux_5_10_arguments_override }}"
           COMMAND_OVERRIDE_6_0: "swift test ${{ inputs.linux_6_0_arguments_override }}"
-          COMMAND_OVERRIDE_NIGHTLY_6_1: "swift test ${{ inputs.linux_nightly_6_1_arguments_override }}"
+          COMMAND_OVERRIDE_NIGHTLY_NEXT: "swift test ${{ inputs.linux_nightly_next_arguments_override }}"
           COMMAND_OVERRIDE_NIGHTLY_MAIN: "swift test ${{ inputs.linux_nightly_main_arguments_override }}"
         run: |
           apt-get -qq update && apt-get -qq -y install curl