Update to go 1.15.8

go1.15.8 (released 2021/02/04) includes fixes to the compiler, linker, runtime,
the go command, and the net/http package. See the Go 1.15.8 milestone on the
issue tracker for details.

https://github.com/golang/go/issues?q=milestone%3AGo1.15.8+label%3ACherryPickApproved

full diff: https://github.com/golang/go/compare/go1.15.7...go1.15.8

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [1.15.7]
+        go-version: [1.15.8]
         os: [ubuntu-18.04, macos-10.15, windows-2019]
 
     steps:
@@ -73,7 +73,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - uses: actions/checkout@v2
         with:
@@ -106,7 +106,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - name: Set env
         shell: bash
@@ -139,7 +139,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - name: Set env
         shell: bash
@@ -181,7 +181,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - uses: actions/checkout@v2
         with:
@@ -249,7 +249,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - uses: actions/checkout@v2
         with:

.github/workflows/nightly.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - uses: actions/checkout@v2
         with:
@@ -131,7 +131,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - uses: actions/checkout@v2
         with:

.github/workflows/release.yml

@@ -62,7 +62,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v1
         with:
-          go-version: '1.15.7'
+          go-version: '1.15.8'
 
       - name: Set env
         shell: bash