GHA: timestamp the caches

Enable the timestamp in the caches to make sure that the correct cache
is restored. This should hopefully help increase the cache hit rate.

Author: compnerd

.github/workflows/swift-toolchain.yml

@@ -344,7 +344,6 @@ jobs:
           max-size: 100M
           key: ${{ matrix.os }}-${{ matrix.arch }}-sqlite
           variant: sccache
-          append-timestamp: false
 
       - uses: nttld/setup-ndk@v1
         id: setup-ndk
@@ -609,7 +608,6 @@ jobs:
           max-size: 1M
           key: windows-${{ matrix.arch }}-cmark-gfm
           variant: sccache
-          append-timestamp: false
 
       - name: Configure cmark-gfm
         run: >
@@ -668,7 +666,6 @@ jobs:
           max-size: 100M
           key: windows-amd64-build_tools
           variant: sccache
-          append-timestamp: false
 
       - name: Configure Tools
         run: |
@@ -850,7 +847,6 @@ jobs:
           max-size: 500M
           key: windows-${{ matrix.arch }}-compilers
           variant: sccache
-          append-timestamp: false
 
       - name: Configure Compilers
         env:
@@ -1084,7 +1080,6 @@ jobs:
           max-size: 100M
           key: ${{ matrix.os }}-${{ matrix.arch }}-zlib
           variant: sccache
-          append-timestamp: false
 
       - uses: nttld/setup-ndk@v1
         id: setup-ndk
@@ -1213,7 +1208,6 @@ jobs:
           max-size: 100M
           key: ${{ matrix.os }}-${{ matrix.arch }}-curl
           variant: sccache
-          append-timestamp: false
 
       - uses: nttld/setup-ndk@v1
         id: setup-ndk
@@ -1414,7 +1408,6 @@ jobs:
           max-size: 100M
           key: ${{ matrix.os }}-${{ matrix.arch }}-libxml2
           variant: sccache
-          append-timestamp: false
 
       - uses: nttld/setup-ndk@v1
         id: setup-ndk