build: bump RUSTC_VERSION to 1.88 in github workflows

Signed-off-by: Joyee Cheung <joyeec9h3@gmail.com>

Author: joyeecheung

.github/workflows/coverage-windows.yml

@@ -62,7 +62,7 @@ concurrency:
 env:
   PYTHON_VERSION: '3.14'
   FLAKY_TESTS: keep_retrying
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read

.github/workflows/stress-test.yml

@@ -36,7 +36,7 @@ env:
   PYTHON_VERSION: '3.14'
   XCODE_VERSION: '16.4'
   CLANG_VERSION: '19'
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read

.github/workflows/test-linux-quic.yml

@@ -37,7 +37,7 @@ env:
   CXX: ${{ (github.base_ref == 'main' || github.ref_name == 'main') && 'sccache' || '' }} clang++-19
   SCCACHE_GHA_ENABLED: ${{ github.base_ref == 'main' || github.ref_name == 'main' }}
   SCCACHE_IDLE_TIMEOUT: '0'
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read

.github/workflows/test-linux.yml

@@ -46,7 +46,7 @@ env:
   CXX: ${{ (github.base_ref == 'main' || github.ref_name == 'main') && 'sccache' || '' }} clang++-19
   SCCACHE_GHA_ENABLED: ${{ github.base_ref == 'main' || github.ref_name == 'main' }}
   SCCACHE_IDLE_TIMEOUT: '0'
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read

.github/workflows/test-macos.yml

@@ -68,7 +68,7 @@ env:
   PYTHON_VERSION: '3.14'
   XCODE_VERSION: '16.4'
   FLAKY_TESTS: keep_retrying
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read